From jhorne at skopos.us Thu Mar 21 14:42:27 2013 Content-Type: multipart/mixed; boundary="===============4273324261648699795==" MIME-Version: 1.0 From: Jonathan Horne To: users at ovirt.org Subject: [Users] rebooting physical network that ovirt is attached to Date: Thu, 21 Mar 2013 18:42:00 +0000 Message-ID: <9BE6F493F83A594DA60C45E6A09DC5AC2B23BF82@AUSP01DAG0201> --===============4273324261648699795== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable --_000_9BE6F493F83A594DA60C45E6A09DC5AC2B23BF82AUSP01DAG0201_ Content-Type: text/plain; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable greetings, we are talking about possibly upgrading our cisco gear tonight, and this wi= =3D ll affect our ovirt environment. what can i expect if i were to reboot first the switch that all VMguest VLA= =3D Ns are going thru, ad then afterwards rebooting the switch that all ovirtmg= =3D mt connections are in? how will the ovirt environment behave with loss of = =3D network connectivity for a couple minutes? the iscsi network is not going to be affected. any information or stories = =3D of similar experiences would be appreciated. thanks, jonathan ________________________________ This is a PRIVATE message. If you are not the intended recipient, please de= =3D lete without copying and kindly advise us by e-mail of the mistake in deliv= =3D ery. NOTE: Regardless of content, this e-mail shall not operate to bind SKO= =3D POS to any order or other contract unless pursuant to explicit written agre= =3D ement or government initiative expressly permitting the use of e-mail for s= =3D uch purpose. --_000_9BE6F493F83A594DA60C45E6A09DC5AC2B23BF82AUSP01DAG0201_ Content-Type: text/html; charset=3D"us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable
greetings,

we are talking about possibly upgrading our cisco gear tonight, and th= =3D is will affect our ovirt environment.

what can i expect if i were to reboot first the switch that all VMgues= =3D t VLANs are going thru, ad then afterwards rebooting the switch that all ov= =3D irtmgmt connections are in?  how will the ovirt environment behave wit= =3D h loss of network connectivity for a couple minutes?

the iscsi network is not going to be affected.  any information o= =3D r stories of similar experiences would be appreciated.

thanks,
jonathan


This is a PRIVATE mess= age. I=3D f you are not the intended recipient, please delete without copying and kin= =3D dly advise us by e-mail of the mistake in delivery. NOTE: Regardless of con= =3D tent, this e-mail shall not operate to bind SKOPOS to any order or other contract unless pursuant to explicit wri= =3D tten agreement or government initiative expressly permitting the use of e-m= =3D ail for such purpose. --_000_9BE6F493F83A594DA60C45E6A09DC5AC2B23BF82AUSP01DAG0201_-- --===============4273324261648699795== Content-Type: multipart/alternative MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="attachment.bin" LS1fMDAwXzlCRTZGNDkzRjgzQTU5NERBNjBDNDVFNkEwOURDNUFDMkIyM0JGODJBVVNQMDFEQUcw MjAxXwpDb250ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9InVzLWFzY2lpIgpDb250ZW50 LVRyYW5zZmVyLUVuY29kaW5nOiBxdW90ZWQtcHJpbnRhYmxlCgpncmVldGluZ3MsCgp3ZSBhcmUg dGFsa2luZyBhYm91dCBwb3NzaWJseSB1cGdyYWRpbmcgb3VyIGNpc2NvIGdlYXIgdG9uaWdodCwg YW5kIHRoaXMgd2k9CmxsIGFmZmVjdCBvdXIgb3ZpcnQgZW52aXJvbm1lbnQuCgp3aGF0IGNhbiBp IGV4cGVjdCBpZiBpIHdlcmUgdG8gcmVib290IGZpcnN0IHRoZSBzd2l0Y2ggdGhhdCBhbGwgVk1n dWVzdCBWTEE9Ck5zIGFyZSBnb2luZyB0aHJ1LCBhZCB0aGVuIGFmdGVyd2FyZHMgcmVib290aW5n IHRoZSBzd2l0Y2ggdGhhdCBhbGwgb3ZpcnRtZz0KbXQgY29ubmVjdGlvbnMgYXJlIGluPyAgaG93 IHdpbGwgdGhlIG92aXJ0IGVudmlyb25tZW50IGJlaGF2ZSB3aXRoIGxvc3Mgb2YgPQpuZXR3b3Jr IGNvbm5lY3Rpdml0eSBmb3IgYSBjb3VwbGUgbWludXRlcz8KCnRoZSBpc2NzaSBuZXR3b3JrIGlz IG5vdCBnb2luZyB0byBiZSBhZmZlY3RlZC4gIGFueSBpbmZvcm1hdGlvbiBvciBzdG9yaWVzID0K b2Ygc2ltaWxhciBleHBlcmllbmNlcyB3b3VsZCBiZSBhcHByZWNpYXRlZC4KCnRoYW5rcywKam9u YXRoYW4KCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpUaGlzIGlzIGEgUFJJVkFU RSBtZXNzYWdlLiBJZiB5b3UgYXJlIG5vdCB0aGUgaW50ZW5kZWQgcmVjaXBpZW50LCBwbGVhc2Ug ZGU9CmxldGUgd2l0aG91dCBjb3B5aW5nIGFuZCBraW5kbHkgYWR2aXNlIHVzIGJ5IGUtbWFpbCBv ZiB0aGUgbWlzdGFrZSBpbiBkZWxpdj0KZXJ5LiBOT1RFOiBSZWdhcmRsZXNzIG9mIGNvbnRlbnQs IHRoaXMgZS1tYWlsIHNoYWxsIG5vdCBvcGVyYXRlIHRvIGJpbmQgU0tPPQpQT1MgdG8gYW55IG9y ZGVyIG9yIG90aGVyIGNvbnRyYWN0IHVubGVzcyBwdXJzdWFudCB0byBleHBsaWNpdCB3cml0dGVu IGFncmU9CmVtZW50IG9yIGdvdmVybm1lbnQgaW5pdGlhdGl2ZSBleHByZXNzbHkgcGVybWl0dGlu ZyB0aGUgdXNlIG9mIGUtbWFpbCBmb3Igcz0KdWNoIHB1cnBvc2UuCgotLV8wMDBfOUJFNkY0OTNG ODNBNTk0REE2MEM0NUU2QTA5REM1QUMyQjIzQkY4MkFVU1AwMURBRzAyMDFfCkNvbnRlbnQtVHlw ZTogdGV4dC9odG1sOyBjaGFyc2V0PSJ1cy1hc2NpaSIKQ29udGVudC1JRDogPERERUYyOTEwMDRF QUUxNDM4RjAyM0QwMzAxNjA1QThFQGNvbGxhYm9yYXRpb25ob3N0Lm5ldD4KQ29udGVudC1UcmFu c2Zlci1FbmNvZGluZzogcXVvdGVkLXByaW50YWJsZQoKPGh0bWw+CjxoZWFkPgo8bWV0YSBodHRw LWVxdWl2PTNEIkNvbnRlbnQtVHlwZSIgY29udGVudD0zRCJ0ZXh0L2h0bWw7IGNoYXJzZXQ9M0R1 cy1hc2NpaSI9Cj4KPC9oZWFkPgo8Ym9keSBzdHlsZT0zRCJ3b3JkLXdyYXA6YnJlYWstd29yZDsg Y29sb3I6cmdiKDAsMCwwKTsgZm9udC1zaXplOjE0cHg7IGZvbnQ9Ci1mYW1pbHk6Q2FsaWJyaSxz YW5zLXNlcmlmIj4KPGRpdj5ncmVldGluZ3MsPC9kaXY+CjxkaXY+PGJyPgo8L2Rpdj4KPGRpdj53 ZSBhcmUgdGFsa2luZyBhYm91dCBwb3NzaWJseSB1cGdyYWRpbmcgb3VyIGNpc2NvIGdlYXIgdG9u aWdodCwgYW5kIHRoPQppcyB3aWxsIGFmZmVjdCBvdXIgb3ZpcnQgZW52aXJvbm1lbnQuPC9kaXY+ CjxkaXY+PGJyPgo8L2Rpdj4KPGRpdj53aGF0IGNhbiBpIGV4cGVjdCBpZiBpIHdlcmUgdG8gcmVi b290IGZpcnN0IHRoZSBzd2l0Y2ggdGhhdCBhbGwgVk1ndWVzPQp0IFZMQU5zIGFyZSBnb2luZyB0 aHJ1LCBhZCB0aGVuIGFmdGVyd2FyZHMgcmVib290aW5nIHRoZSBzd2l0Y2ggdGhhdCBhbGwgb3Y9 CmlydG1nbXQgY29ubmVjdGlvbnMgYXJlIGluPyAmbmJzcDtob3cgd2lsbCB0aGUgb3ZpcnQgZW52 aXJvbm1lbnQgYmVoYXZlIHdpdD0KaCBsb3NzIG9mIG5ldHdvcmsgY29ubmVjdGl2aXR5IGZvciBh CiBjb3VwbGUgbWludXRlcz88L2Rpdj4KPGRpdj48YnI+CjwvZGl2Pgo8ZGl2PnRoZSBpc2NzaSBu ZXR3b3JrIGlzIG5vdCBnb2luZyB0byBiZSBhZmZlY3RlZC4gJm5ic3A7YW55IGluZm9ybWF0aW9u IG89CnIgc3RvcmllcyBvZiBzaW1pbGFyIGV4cGVyaWVuY2VzIHdvdWxkIGJlIGFwcHJlY2lhdGVk LjwvZGl2Pgo8ZGl2Pjxicj4KPC9kaXY+CjxkaXY+dGhhbmtzLDwvZGl2Pgo8ZGl2PmpvbmF0aGFu PC9kaXY+Cjxicj4KPGJyPgo8aHI+Cjxmb250IGNvbG9yPTNEIkdyYXkiIGZhY2U9M0QiQXJpYWwi IHNpemU9M0QiMSI+VGhpcyBpcyBhIFBSSVZBVEUgbWVzc2FnZS4gST0KZiB5b3UgYXJlIG5vdCB0 aGUgaW50ZW5kZWQgcmVjaXBpZW50LCBwbGVhc2UgZGVsZXRlIHdpdGhvdXQgY29weWluZyBhbmQg a2luPQpkbHkgYWR2aXNlIHVzIGJ5IGUtbWFpbCBvZiB0aGUgbWlzdGFrZSBpbiBkZWxpdmVyeS4g Tk9URTogUmVnYXJkbGVzcyBvZiBjb249CnRlbnQsIHRoaXMgZS1tYWlsIHNoYWxsIG5vdCBvcGVy YXRlIHRvCiBiaW5kIFNLT1BPUyB0byBhbnkgb3JkZXIgb3Igb3RoZXIgY29udHJhY3QgdW5sZXNz IHB1cnN1YW50IHRvIGV4cGxpY2l0IHdyaT0KdHRlbiBhZ3JlZW1lbnQgb3IgZ292ZXJubWVudCBp bml0aWF0aXZlIGV4cHJlc3NseSBwZXJtaXR0aW5nIHRoZSB1c2Ugb2YgZS1tPQphaWwgZm9yIHN1 Y2ggcHVycG9zZS48L2ZvbnQ+CjwvYm9keT4KPC9odG1sPgoKLS1fMDAwXzlCRTZGNDkzRjgzQTU5 NERBNjBDNDVFNkEwOURDNUFDMkIyM0JGODJBVVNQMDFEQUcwMjAxXy0tCg== --===============4273324261648699795==-- From lvernia at redhat.com Sun Mar 24 06:03:19 2013 Content-Type: multipart/mixed; boundary="===============5770507758011494639==" MIME-Version: 1.0 From: Lior Vernia To: users at ovirt.org Subject: Re: [Users] rebooting physical network that ovirt is attached to Date: Sun, 24 Mar 2013 12:04:52 +0200 Message-ID: <514ECFC4.4010600@redhat.com> In-Reply-To: 9BE6F493F83A594DA60C45E6A09DC5AC2B23BF82@AUSP01DAG0201 --===============5770507758011494639== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Hello Jonathan, First of all let me apologize for not being more responsive, seems like you got the worse end of time difference. Now, in case the question is still relevant: 1. Rebooting the first switch won't cause any damage. The VMs will lose connectivity on the VLANs, but they should still be manageable through oVirt and run normally on their hosts. 2. Rebooting the second one could prove more troublesome. Firstly, as a preemptive measure I would advise that you not have any VMs running on your host marked as SPM at the moment of reboot, if possible - there's risk that VMs running on your SPM will be shut down violently when it loses connectivity (or the moment it regains connectivity). Also, if any of your VMs have thin provisioning defined and they exhaust their storage during downtime, they'll run into trouble; but as far as I know they should be okay if they're not running processes that can suddenly demand a lot more storage. That's as far as possible damage goes. Besides that, when the switch comes back up, some components (host, data domain) might appear as non-operational or down, and you might have to reactivate them manually from the webadmin console. Hope this helps. Yours, Lior Vernia. On 21/03/13 20:42, Jonathan Horne wrote: > greetings, > = > we are talking about possibly upgrading our cisco gear tonight, and this > will affect our ovirt environment. > = > what can i expect if i were to reboot first the switch that all VMguest > VLANs are going thru, ad then afterwards rebooting the switch that all > ovirtmgmt connections are in? how will the ovirt environment behave > with loss of network connectivity for a couple minutes? > = > the iscsi network is not going to be affected. any information or > stories of similar experiences would be appreciated. > = > thanks, > jonathan > = > = > ------------------------------------------------------------------------ > This is a PRIVATE message. If you are not the intended recipient, please > delete without copying and kindly advise us by e-mail of the mistake in > delivery. NOTE: Regardless of content, this e-mail shall not operate to > bind SKOPOS to any order or other contract unless pursuant to explicit > written agreement or government initiative expressly permitting the use > of e-mail for such purpose. > = > = > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users >=20 --===============5770507758011494639==-- From alex.tuxx at gmail.com Sun Mar 24 08:39:47 2013 Content-Type: multipart/mixed; boundary="===============2772066481269405700==" MIME-Version: 1.0 From: Alex Leonhardt To: users at ovirt.org Subject: Re: [Users] rebooting physical network that ovirt is attached to Date: Sun, 24 Mar 2013 12:39:44 +0000 Message-ID: <514EF410.2070206@gmail.com> In-Reply-To: 514ECFC4.4010600@redhat.com --===============2772066481269405700== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable This is a multi-part message in MIME format. --------------020402080306010409060609 Content-Type: text/plain; charset=3DISO-8859-1; format=3Dflowed Content-Transfer-Encoding: 7bit From experience, I would shutdown the ovirt engine before you do any = work related to networking. The VMs will keep running w/o the engine = available, you're simply unable to add/remove/failover VMs, etc. The = VDSM running on the host will be unable to get instructions to "kill" = any VMs as the engine is already "down" :) ... hope it helps! alex On 03/24/2013 10:04 AM, Lior Vernia wrote: > Hello Jonathan, > > First of all let me apologize for not being more responsive, seems like > you got the worse end of time difference. > > Now, in case the question is still relevant: > > 1. Rebooting the first switch won't cause any damage. The VMs will lose > connectivity on the VLANs, but they should still be manageable through > oVirt and run normally on their hosts. > > 2. Rebooting the second one could prove more troublesome. Firstly, as a > preemptive measure I would advise that you not have any VMs running on > your host marked as SPM at the moment of reboot, if possible - there's > risk that VMs running on your SPM will be shut down violently when it > loses connectivity (or the moment it regains connectivity). Also, if any > of your VMs have thin provisioning defined and they exhaust their > storage during downtime, they'll run into trouble; but as far as I know > they should be okay if they're not running processes that can suddenly > demand a lot more storage. That's as far as possible damage goes. > Besides that, when the switch comes back up, some components (host, data > domain) might appear as non-operational or down, and you might have to > reactivate them manually from the webadmin console. > > Hope this helps. > > Yours, Lior Vernia. > > On 21/03/13 20:42, Jonathan Horne wrote: >> greetings, >> >> we are talking about possibly upgrading our cisco gear tonight, and this >> will affect our ovirt environment. >> >> what can i expect if i were to reboot first the switch that all VMguest >> VLANs are going thru, ad then afterwards rebooting the switch that all >> ovirtmgmt connections are in? how will the ovirt environment behave >> with loss of network connectivity for a couple minutes? >> >> the iscsi network is not going to be affected. any information or >> stories of similar experiences would be appreciated. >> >> thanks, >> jonathan >> >> >> ------------------------------------------------------------------------ >> This is a PRIVATE message. If you are not the intended recipient, please >> delete without copying and kindly advise us by e-mail of the mistake in >> delivery. NOTE: Regardless of content, this e-mail shall not operate to >> bind SKOPOS to any order or other contract unless pursuant to explicit >> written agreement or government initiative expressly permitting the use >> of e-mail for such purpose. >> >> >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users --------------020402080306010409060609 Content-Type: text/html; charset=3DISO-8859-1 Content-Transfer-Encoding: 7bit From experience, I would shutdown the ovirt engine before you do any work related to networking. The VMs will keep running w/o the engine available, you're simply unable to add/remove/failover VMs, etc. The VDSM running on the host will be unable to get instructions to "kill" any VMs as the engine is already "down" :) ...

hope it helps!
alex




On 03/24/2013 10:04 AM, Lior Vernia wrote: 
Hello Jonathan,

First of all let me apologize for not being more responsive, seems like
you got the worse end of time difference.

Now, in case the question is still relevant:

1. Rebooting the first switch won't cause any damage. The VMs will lose
connectivity on the VLANs, but they should still be manageable through
oVirt and run normally on their hosts.

2. Rebooting the second one could prove more troublesome. Firstly, as a
preemptive measure I would advise that you not have any VMs running on
your host marked as SPM at the moment of reboot, if possible - there's
risk that VMs running on your SPM will be shut down violently when it
loses connectivity (or the moment it regains connectivity). Also, if any
of your VMs have thin provisioning defined and they exhaust their
storage during downtime, they'll run into trouble; but as far as I know
they should be okay if they're not running processes that can suddenly
demand a lot more storage. That's as far as possible damage goes.
Besides that, when the switch comes back up, some components (host, data
domain) might appear as non-operational or down, and you might have to
reactivate them manually from the webadmin console.

Hope this helps.

Yours, Lior Vernia.

On 21/03/13 20:42, Jonathan Horne wrote:

greetings,

we are talking about possibly upgrading our cisco gear tonight, and this
will affect our ovirt environment.

what can i expect if i were to reboot first the switch that all VMguest
VLANs are going thru, ad then afterwards rebooting the switch that all
ovirtmgmt connections are in?  how will the ovirt environment behave
with loss of network connectivity for a couple minutes?

the iscsi network is not going to be affected.  any information or
stories of similar experiences would be appreciated.

thanks,
jonathan


------------------------------------------------------------------------
This is a PRIVATE message. If you are not the intended recipient, please
delete without copying and kindly advise us by e-mail of the mistake in
delivery. NOTE: Regardless of content, this e-mail shall not operate to
bind SKOPOS to any order or other contract unless pursuant to explicit
written agreement or government initiative expressly permitting the use
of e-mail for such purpose.


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lvernia at redhat.com Sun Mar 24 09:10:42 2013 Content-Type: multipart/mixed; boundary="===============7639790221943626353==" MIME-Version: 1.0 From: Lior Vernia To: users at ovirt.org Subject: Re: [Users] rebooting physical network that ovirt is attached to Date: Sun, 24 Mar 2013 15:12:13 +0200 Message-ID: <514EFBAD.2020703@redhat.com> In-Reply-To: 514EF410.2070206@gmail.com --===============7639790221943626353== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable +1, better solution than mine (safer, simpler), thank you Alex. Do still keep in mind the possible trouble with thin provisioning. On 24/03/13 14:39, Alex Leonhardt wrote: > From experience, I would shutdown the ovirt engine before you do any > work related to networking. The VMs will keep running w/o the engine > available, you're simply unable to add/remove/failover VMs, etc. The > VDSM running on the host will be unable to get instructions to "kill" > any VMs as the engine is already "down" :) ... > = > hope it helps! > alex > = > = > = > = > On 03/24/2013 10:04 AM, Lior Vernia wrote: >> Hello Jonathan, >> >> First of all let me apologize for not being more responsive, seems like >> you got the worse end of time difference. >> >> Now, in case the question is still relevant: >> >> 1. Rebooting the first switch won't cause any damage. The VMs will lose >> connectivity on the VLANs, but they should still be manageable through >> oVirt and run normally on their hosts. >> >> 2. Rebooting the second one could prove more troublesome. Firstly, as a >> preemptive measure I would advise that you not have any VMs running on >> your host marked as SPM at the moment of reboot, if possible - there's >> risk that VMs running on your SPM will be shut down violently when it >> loses connectivity (or the moment it regains connectivity). Also, if any >> of your VMs have thin provisioning defined and they exhaust their >> storage during downtime, they'll run into trouble; but as far as I know >> they should be okay if they're not running processes that can suddenly >> demand a lot more storage. That's as far as possible damage goes. >> Besides that, when the switch comes back up, some components (host, data >> domain) might appear as non-operational or down, and you might have to >> reactivate them manually from the webadmin console. >> >> Hope this helps. >> >> Yours, Lior Vernia. >> >> On 21/03/13 20:42, Jonathan Horne wrote: >>> greetings, >>> >>> we are talking about possibly upgrading our cisco gear tonight, and this >>> will affect our ovirt environment. >>> >>> what can i expect if i were to reboot first the switch that all VMguest >>> VLANs are going thru, ad then afterwards rebooting the switch that all >>> ovirtmgmt connections are in? how will the ovirt environment behave >>> with loss of network connectivity for a couple minutes? >>> >>> the iscsi network is not going to be affected. any information or >>> stories of similar experiences would be appreciated. >>> >>> thanks, >>> jonathan >>> >>> >>> ------------------------------------------------------------------------ >>> This is a PRIVATE message. If you are not the intended recipient, please >>> delete without copying and kindly advise us by e-mail of the mistake in >>> delivery. NOTE: Regardless of content, this e-mail shall not operate to >>> bind SKOPOS to any order or other contract unless pursuant to explicit >>> written agreement or government initiative expressly permitting the use >>> of e-mail for such purpose. >>> >>> >>> _______________________________________________ >>> Users mailing list >>> Users(a)ovirt.org >>> http://lists.ovirt.org/mailman/listinfo/users >>> >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users --===============7639790221943626353==-- From jhorne at skopos.us Sun Mar 24 09:42:44 2013 Content-Type: multipart/mixed; boundary="===============6840181928627999957==" MIME-Version: 1.0 From: Jonathan Horne To: users at ovirt.org Subject: Re: [Users] rebooting physical network that ovirt is attached to Date: Sun, 24 Mar 2013 13:42:41 +0000 Message-ID: <9BE6F493F83A594DA60C45E6A09DC5AC2B6CF21D@AUSP01DAG0201> In-Reply-To: 514EF410.2070206@gmail.com --===============6840181928627999957== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable --_000_9BE6F493F83A594DA60C45E6A09DC5AC2B6CF21DAUSP01DAG0201_ Content-Type: text/plain; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable Ah, thank you much lior and alex. I believe this also answers my other thread, that is is ok to reboot the ma= =3D nagement server at any time? (I have another thread about how sluggish mine= =3D is running lately, and id like to get it rebooted soon before I go on vaca= =3D tion). Thanks again! jonathan From: Alex Leonhardt [mailto:alex.tuxx(a)gmail.com] Sent: Sunday, March 24, 2013 7:40 AM To: Lior Vernia Cc: Jonathan Horne; users(a)ovirt.org Subject: Re: [Users] rebooting physical network that ovirt is attached to >From experience, I would shutdown the ovirt engine before you do any work = r=3D elated to networking. The VMs will keep running w/o the engine available, y= =3D ou're simply unable to add/remove/failover VMs, etc. The VDSM running on th= =3D e host will be unable to get instructions to "kill" any VMs as the engine i= =3D s already "down" :) ... hope it helps! alex On 03/24/2013 10:04 AM, Lior Vernia wrote: Hello Jonathan, First of all let me apologize for not being more responsive, seems like you got the worse end of time difference. Now, in case the question is still relevant: 1. Rebooting the first switch won't cause any damage. The VMs will lose connectivity on the VLANs, but they should still be manageable through oVirt and run normally on their hosts. 2. Rebooting the second one could prove more troublesome. Firstly, as a preemptive measure I would advise that you not have any VMs running on your host marked as SPM at the moment of reboot, if possible - there's risk that VMs running on your SPM will be shut down violently when it loses connectivity (or the moment it regains connectivity). Also, if any of your VMs have thin provisioning defined and they exhaust their storage during downtime, they'll run into trouble; but as far as I know they should be okay if they're not running processes that can suddenly demand a lot more storage. That's as far as possible damage goes. Besides that, when the switch comes back up, some components (host, data domain) might appear as non-operational or down, and you might have to reactivate them manually from the webadmin console. Hope this helps. Yours, Lior Vernia. On 21/03/13 20:42, Jonathan Horne wrote: greetings, we are talking about possibly upgrading our cisco gear tonight, and this will affect our ovirt environment. what can i expect if i were to reboot first the switch that all VMguest VLANs are going thru, ad then afterwards rebooting the switch that all ovirtmgmt connections are in? how will the ovirt environment behave with loss of network connectivity for a couple minutes? the iscsi network is not going to be affected. any information or stories of similar experiences would be appreciated. thanks, jonathan ------------------------------------------------------------------------ This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind SKOPOS to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users ________________________________ This is a PRIVATE message. If you are not the intended recipient, please de= =3D lete without copying and kindly advise us by e-mail of the mistake in deliv= =3D ery. NOTE: Regardless of content, this e-mail shall not operate to bind SKO= =3D POS to any order or other contract unless pursuant to explicit written agre= =3D ement or government initiative expressly permitting the use of e-mail for s= =3D uch purpose. --_000_9BE6F493F83A594DA60C45E6A09DC5AC2B6CF21DAUSP01DAG0201_ Content-Type: text/html; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable

Ah, thank you much lior= =3D and alex.

 

I believe this also ans= =3D wers my other thread, that is is ok to reboot the management server at any = =3D time? (I have another thread about how sluggish mine is running lately, and id like to get it rebooted soon before I go on vacatio= =3D n).

 

Thanks again!

jonathan

 

From: Alex Leonhardt [mailto:alex.tuxx(a)gmail.com]
Sent: Sunday, March 24, 2013 7:40 AM
To: Lior Vernia
Cc: Jonathan Horne; users(a)ovirt.org
Subject: Re: [Users] rebooting physical network that ovirt is attach= =3D ed to

 

From experience, I would shutdown the o= =3D virt engine before you do any work related to networking. The VMs will keep= =3D running w/o the engine available, you're simply unable to add/remove/failover VMs, etc. The VDSM running on the host will be unab= =3D le to get instructions to "kill" any VMs as the engine is already= =3D "down" :) ...

hope it helps!
alex




On 03/24/2013 10:04 AM, Lior Vernia wrote: 

Hello Jonathan,
 
First of all let me apologize for not being more responsive, seems lik=
=3D
e
you got the worse end of time difference.
 
Now, in case the question is still relevant:
 
1. Rebooting the first switch won't cause any damage. The VMs will los=
=3D
e
connectivity on the VLANs, but they should still be manageable through=
=3D

oVirt and run normally on their hosts.
 
2. Rebooting the second one could prove more troublesome. Firstly, as =
=3D
a
preemptive measure I would advise that you not have any VMs running on=
=3D

your host marked as SPM at the moment of reboot, if possible - there's=
=3D

risk that VMs running on your SPM will be shut down violently when it<=
=3D
/pre>

loses connectivity (or the moment it regains connectivity). Also, if a=
=3D
ny


of your VMs have thin provisioning defined and they exhaust their

storage during downtime, they'll run into trouble; but as far as I kno=
=3D
w


they should be okay if they're not running processes that can suddenly=
=3D



demand a lot more storage. That's as far as possible damage goes.

Besides that, when the switch comes back up, some components (host, da=
=3D
ta


domain) might appear as non-operational or down, and you might have to=
=3D



reactivate them manually from the webadmin console.


 


Hope this helps.


 


Yours, Lior Vernia.


 


On 21/03/13 20:42, Jonathan Horne wrote:




greetings,


 


we are talking about possibly upgrading our cisco gear tonight, and th=
=3D
is


will affect our ovirt environment.


 


what can i expect if i were to reboot first the switch that all VMgues=
=3D
t


VLANs are going thru, ad then afterwards rebooting the switch that all=
=3D



ovirtmgmt connections are in?  how will the ovirt environment beh=
=3D
ave


with loss of network connectivity for a couple minutes?


 


the iscsi network is not going to be affected.  any information o=
=3D
r


stories of similar experiences would be appreciated.


 


thanks,


jonathan


 


 


----------------------------------------------------------------------=
=3D
--


This is a PRIVATE message. If you are not the intended recipient, plea=
=3D
se


delete without copying and kindly advise us by e-mail of the mistake i=
=3D
n


delivery. NOTE: Regardless of content, this e-mail shall not operate t=
=3D
o


bind SKOPOS to any order or other contract unless pursuant to explicit=
=3D



written agreement or government initiative expressly permitting the us=
=3D
e


of e-mail for such purpose.


 


 


_______________________________________________


Users mailing list


Users(a)ovirt.org


http://lis=
ts=3D
.ovirt.org/mailman/listinfo/users


 




_______________________________________________


Users mailing list


Users(a)ovirt.org


http://lis=
ts=3D
.ovirt.org/mailman/listinfo/users

This is a PRIVATE mess= age. I=3D f you are not the intended recipient, please delete without copying and kin= =3D dly advise us by e-mail of the mistake in delivery. 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Subject: Re: [Users] rebooting physical network that ovirt is attached to Date: Sun, 24 Mar 2013 16:21:07 +0200 Message-ID: <514F0BD3.1@redhat.com> In-Reply-To: 9BE6F493F83A594DA60C45E6A09DC5AC2B6CF21D@AUSP01DAG0201 --===============5958911488835977884== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Hello Jonathan, Having taken a look at the other thread, your original assumption was correct - aside from NFS, your nodes and VMs should generally be fine during a reboot (again, excluding cases as I mentioned for thin provisioning). As for the NFS services your server is providing, I'm no expert when it comes to storage, so my best advice would be to wait for someone on the other thread to give you a definite answer (also it sounds like there's a bigger issue weighing on your server, causing it to be sluggish). However, if you're pressed for time - I think you should be fine as long as you detach the NFS domains in an orderly fashion before you take the server down for a reboot, and then reattach them when it's back up. As far as I know (and again I'm no expert), both of these domains aren't critical most of the time; ISO domains are critical when you have VMs accessing them (during installation and such), and export domains when you're moving VMs around. Also, you might want to try IRC to see if someone more knowledgeable than me might answer you in real time: irc://irc.oftc.net/ovirt. Yours, Lior. On 24/03/13 15:42, Jonathan Horne wrote: > Ah, thank you much lior and alex. > = > = > = > I believe this also answers my other thread, that is is ok to reboot the > management server at any time? (I have another thread about how sluggish > mine is running lately, and id like to get it rebooted soon before I go > on vacation). > = > = > = > Thanks again! > = > jonathan > = > = > = > *From:*Alex Leonhardt [mailto:alex.tuxx(a)gmail.com] > *Sent:* Sunday, March 24, 2013 7:40 AM > *To:* Lior Vernia > *Cc:* Jonathan Horne; users(a)ovirt.org > *Subject:* Re: [Users] rebooting physical network that ovirt is attached = to > = > = > = > From experience, I would shutdown the ovirt engine before you do any > work related to networking. The VMs will keep running w/o the engine > available, you're simply unable to add/remove/failover VMs, etc. The > VDSM running on the host will be unable to get instructions to "kill" > any VMs as the engine is already "down" :) ... > = > hope it helps! > alex > = > = > = > = > On 03/24/2013 10:04 AM, Lior Vernia wrote: > = > Hello Jonathan, > = > = > = > First of all let me apologize for not being more responsive, seems like > = > you got the worse end of time difference. > = > = > = > Now, in case the question is still relevant: > = > = > = > 1. Rebooting the first switch won't cause any damage. The VMs will lose > = > connectivity on the VLANs, but they should still be manageable through > = > oVirt and run normally on their hosts. > = > = > = > 2. Rebooting the second one could prove more troublesome. Firstly, as a > = > preemptive measure I would advise that you not have any VMs running on > = > your host marked as SPM at the moment of reboot, if possible - there's > = > risk that VMs running on your SPM will be shut down violently when it > = > loses connectivity (or the moment it regains connectivity). Also, if any > = > of your VMs have thin provisioning defined and they exhaust their > = > storage during downtime, they'll run into trouble; but as far as I know > = > they should be okay if they're not running processes that can suddenly > = > demand a lot more storage. That's as far as possible damage goes. > = > Besides that, when the switch comes back up, some components (host, data > = > domain) might appear as non-operational or down, and you might have to > = > reactivate them manually from the webadmin console. > = > = > = > Hope this helps. > = > = > = > Yours, Lior Vernia. > = > = > = > On 21/03/13 20:42, Jonathan Horne wrote: > = > greetings, > = > = > = > we are talking about possibly upgrading our cisco gear tonight, and t= his > = > will affect our ovirt environment. > = > = > = > what can i expect if i were to reboot first the switch that all VMgue= st > = > VLANs are going thru, ad then afterwards rebooting the switch that all > = > ovirtmgmt connections are in? how will the ovirt environment behave > = > with loss of network connectivity for a couple minutes? > = > = > = > the iscsi network is not going to be affected. any information or > = > stories of similar experiences would be appreciated. > = > = > = > thanks, > = > jonathan > = > = > = > = > = > ---------------------------------------------------------------------= --- > = > This is a PRIVATE message. If you are not the intended recipient, ple= ase > = > delete without copying and kindly advise us by e-mail of the mistake = in > = > delivery. NOTE: Regardless of content, this e-mail shall not operate = to > = > bind SKOPOS to any order or other contract unless pursuant to explicit > = > written agreement or government initiative expressly permitting the u= se > = > of e-mail for such purpose. > = > = > = > = > = > _______________________________________________ > = > Users mailing list > = > Users(a)ovirt.org > = > http://lists.ovirt.org/mailman/listinfo/users > = > = > = > _______________________________________________ > = > Users mailing list > = > Users(a)ovirt.org > = > http://lists.ovirt.org/mailman/listinfo/users > = > = > ------------------------------------------------------------------------ > This is a PRIVATE message. If you are not the intended recipient, please > delete without copying and kindly advise us by e-mail of the mistake in > delivery. NOTE: Regardless of content, this e-mail shall not operate to > bind SKOPOS to any order or other contract unless pursuant to explicit > written agreement or government initiative expressly permitting the use > of e-mail for such purpose. --===============5958911488835977884==-- From tom at ng23.net Sun Mar 24 10:40:25 2013 Content-Type: multipart/mixed; boundary="===============8675803439707150773==" MIME-Version: 1.0 From: Tom Brown To: users at ovirt.org Subject: Re: [Users] rebooting physical network that ovirt is attached to Date: Sun, 24 Mar 2013 14:40:21 +0000 Message-ID: In-Reply-To: 514F0BD3.1@redhat.com --===============8675803439707150773== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable >> = >> = >> I believe this also answers my other thread, that is is ok to reboot the >> management server at any time? (I have another thread about how sluggish >> mine is running lately, and id like to get it rebooted soon before I go >> on vacation). >> = dont reboot the whole server - just restart the jboss cheers --===============8675803439707150773==-- From alex.tuxx at gmail.com Sun Mar 24 12:34:31 2013 Content-Type: multipart/mixed; boundary="===============5127029496269546627==" MIME-Version: 1.0 From: Alex Leonhardt To: users at ovirt.org Subject: Re: [Users] rebooting physical network that ovirt is attached to Date: Sun, 24 Mar 2013 16:34:27 +0000 Message-ID: <514F2B13.4030007@gmail.com> In-Reply-To: 514F0BD3.1@redhat.com --===============5127029496269546627== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable This is a multi-part message in MIME format. --------------090902060900070102080309 Content-Type: text/plain; charset=3DISO-8859-1; format=3Dflowed Content-Transfer-Encoding: 7bit if only export and iso domains are on the ovirt engine host, you're = usually good to just reboot, when the engine is back up and running, = you'll have to manually re-attach the domains back to the data centre... alex On 03/24/2013 02:21 PM, Lior Vernia wrote: > Hello Jonathan, > > Having taken a look at the other thread, your original assumption was > correct - aside from NFS, your nodes and VMs should generally be fine > during a reboot (again, excluding cases as I mentioned for thin > provisioning). > > As for the NFS services your server is providing, I'm no expert when it > comes to storage, so my best advice would be to wait for someone on the > other thread to give you a definite answer (also it sounds like there's > a bigger issue weighing on your server, causing it to be sluggish). > > However, if you're pressed for time - I think you should be fine as long > as you detach the NFS domains in an orderly fashion before you take the > server down for a reboot, and then reattach them when it's back up. As > far as I know (and again I'm no expert), both of these domains aren't > critical most of the time; ISO domains are critical when you have VMs > accessing them (during installation and such), and export domains when > you're moving VMs around. > > Also, you might want to try IRC to see if someone more knowledgeable > than me might answer you in real time: irc://irc.oftc.net/ovirt. > > Yours, Lior. > > On 24/03/13 15:42, Jonathan Horne wrote: >> Ah, thank you much lior and alex. >> >> >> >> I believe this also answers my other thread, that is is ok to reboot the >> management server at any time? (I have another thread about how sluggish >> mine is running lately, and id like to get it rebooted soon before I go >> on vacation). >> >> >> >> Thanks again! >> >> jonathan >> >> >> >> *From:*Alex Leonhardt [mailto:alex.tuxx(a)gmail.com] >> *Sent:* Sunday, March 24, 2013 7:40 AM >> *To:* Lior Vernia >> *Cc:* Jonathan Horne; users(a)ovirt.org >> *Subject:* Re: [Users] rebooting physical network that ovirt is attached= to >> >> >> >> From experience, I would shutdown the ovirt engine before you do any >> work related to networking. The VMs will keep running w/o the engine >> available, you're simply unable to add/remove/failover VMs, etc. The >> VDSM running on the host will be unable to get instructions to "kill" >> any VMs as the engine is already "down" :) ... >> >> hope it helps! >> alex >> >> >> >> >> On 03/24/2013 10:04 AM, Lior Vernia wrote: >> >> Hello Jonathan, >> >> >> >> First of all let me apologize for not being more responsive, seems like >> >> you got the worse end of time difference. >> >> >> >> Now, in case the question is still relevant: >> >> >> >> 1. Rebooting the first switch won't cause any damage. The VMs will lose >> >> connectivity on the VLANs, but they should still be manageable through >> >> oVirt and run normally on their hosts. >> >> >> >> 2. Rebooting the second one could prove more troublesome. Firstly, as a >> >> preemptive measure I would advise that you not have any VMs running on >> >> your host marked as SPM at the moment of reboot, if possible - there's >> >> risk that VMs running on your SPM will be shut down violently when it >> >> loses connectivity (or the moment it regains connectivity). Also, if any >> >> of your VMs have thin provisioning defined and they exhaust their >> >> storage during downtime, they'll run into trouble; but as far as I know >> >> they should be okay if they're not running processes that can suddenly >> >> demand a lot more storage. That's as far as possible damage goes. >> >> Besides that, when the switch comes back up, some components (host, data >> >> domain) might appear as non-operational or down, and you might have to >> >> reactivate them manually from the webadmin console. >> >> >> >> Hope this helps. >> >> >> >> Yours, Lior Vernia. >> >> >> >> On 21/03/13 20:42, Jonathan Horne wrote: >> >> greetings, >> >> >> >> we are talking about possibly upgrading our cisco gear tonight, and= this >> >> will affect our ovirt environment. >> >> >> >> what can i expect if i were to reboot first the switch that all VMg= uest >> >> VLANs are going thru, ad then afterwards rebooting the switch that = all >> >> ovirtmgmt connections are in? how will the ovirt environment behave >> >> with loss of network connectivity for a couple minutes? >> >> >> >> the iscsi network is not going to be affected. any information or >> >> stories of similar experiences would be appreciated. >> >> >> >> thanks, >> >> jonathan >> >> >> >> >> >> -------------------------------------------------------------------= ----- >> >> This is a PRIVATE message. If you are not the intended recipient, p= lease >> >> delete without copying and kindly advise us by e-mail of the mistak= e in >> >> delivery. NOTE: Regardless of content, this e-mail shall not operat= e to >> >> bind SKOPOS to any order or other contract unless pursuant to expli= cit >> >> written agreement or government initiative expressly permitting the= use >> >> of e-mail for such purpose. >> >> >> >> >> >> _______________________________________________ >> >> Users mailing list >> >> Users(a)ovirt.org >> >> http://lists.ovirt.org/mailman/listinfo/users >> >> >> >> _______________________________________________ >> >> Users mailing list >> >> Users(a)ovirt.org >> >> http://lists.ovirt.org/mailman/listinfo/users >> >> >> ------------------------------------------------------------------------ >> This is a PRIVATE message. If you are not the intended recipient, please >> delete without copying and kindly advise us by e-mail of the mistake in >> delivery. NOTE: Regardless of content, this e-mail shall not operate to >> bind SKOPOS to any order or other contract unless pursuant to explicit >> written agreement or government initiative expressly permitting the use >> of e-mail for such purpose. --------------090902060900070102080309 Content-Type: text/html; charset=3DISO-8859-1 Content-Transfer-Encoding: 7bit if only export and iso domains are on the ovirt engine host, you're usually good to just reboot, when the engine is back up and running, you'll have to manually re-attach the domains back to the data centre...

alex


On 03/24/2013 02:21 PM, Lior Vernia wrote: 
Hello Jonathan,

Having taken a look at the other thread, your original assumption was
correct - aside from NFS, your nodes and VMs should generally be fine
during a reboot (again, excluding cases as I mentioned for thin
provisioning).

As for the NFS services your server is providing, I'm no expert when it
comes to storage, so my best advice would be to wait for someone on the
other thread to give you a definite answer (also it sounds like there's
a bigger issue weighing on your server, causing it to be sluggish).

 However, if you're pressed for time - I think you should be fine as long
as you detach the NFS domains in an orderly fashion before you take the
server down for a reboot, and then reattach them when it's back up. As
far as I know (and again I'm no expert), both of these domains aren't
critical most of the time; ISO domains are critical when you have VMs
accessing them (during installation and such), and export domains when
you're moving VMs around.

Also, you might want to try IRC to see if someone more knowledgeable
than me might answer you in real time: irc://irc.oftc.net/ovirt.

Yours, Lior.

On 24/03/13 15:42, Jonathan Horne wrote:

Ah, thank you much lior and alex.

 =


I believe this also answers my other thread, that is is ok to reboot the
management server at any time? (I have another thread about how sluggish
mine is running lately, and id like to get it rebooted soon before I go
on vacation).

 =


Thanks again!

jonathan

 =


*From:*Alex Leonhardt [mailto:alex.tuxx(a)gmail.com]
*Sent:* Sunday, March 24, 2013 7:40 AM
*To:* Lior Vernia
*Cc:* Jonathan Horne; users(a)ovirt.org
*Subject:* Re: [Users] rebooting physical network that ovirt is attached to

 =


>From experience, I would shutdown the ovirt engine before you do any
work related to networking. The VMs will keep running w/o the engine
available, you're simply unable to add/remove/failover VMs, etc. The
VDSM running on the host will be unable to get instructions to "kill"
any VMs as the engine is already "down" :) ...

hope it helps!
alex




On 03/24/2013 10:04 AM, Lior Vernia wrote:

Hello Jonathan,

 =


First of all let me apologize for not being more responsive, seems like

you got the worse end of time difference.

 =


Now, in case the question is still relevant:

 =


1. Rebooting the first switch won't cause any damage. The VMs will lose

connectivity on the VLANs, but they should still be manageable through

oVirt and run normally on their hosts.

 =


2. Rebooting the second one could prove more troublesome. Firstly, as a

preemptive measure I would advise that you not have any VMs running on

your host marked as SPM at the moment of reboot, if possible - there's

risk that VMs running on your SPM will be shut down violently when it

loses connectivity (or the moment it regains connectivity). Also, if any

of your VMs have thin provisioning defined and they exhaust their

storage during downtime, they'll run into trouble; but as far as I know

they should be okay if they're not running processes that can suddenly

demand a lot more storage. That's as far as possible damage goes.

Besides that, when the switch comes back up, some components (host, data

domain) might appear as non-operational or down, and you might have to

reactivate them manually from the webadmin console.

 =


Hope this helps.

 =


Yours, Lior Vernia.

 =


On 21/03/13 20:42, Jonathan Horne wrote:

    greetings,

     =


    we are talking about possibly upgrading our cisco gear tonight, and this

    will affect our ovirt environment.

     =


    what can i expect if i were to reboot first the switch that all VMguest

    VLANs are going thru, ad then afterwards rebooting the switch that all

    ovirtmgmt connections are in?  how will the ovirt environment behave

    with loss of network connectivity for a couple minutes?

     =


    the iscsi network is not going to be affected.  any information or

    stories of similar experiences would be appreciated.

     =


    thanks,

    jonathan

     =


     =


    ------------------------------------------------------------------------

    This is a PRIVATE message. If you are not the intended recipient, please

    delete without copying and kindly advise us by e-mail of the mistake in

    delivery. NOTE: Regardless of content, this e-mail shall not operate to

    bind SKOPOS to any order or other contract unless pursuant to explicit

    written agreement or government initiative expressly permitting the use

    of e-mail for such purpose.

     =


     =


    _______________________________________________

    Users mailing list

    Users(a)ovirt.org <mailto:Users(a)ovirt.org>

    http://lists.ovirt.org/mailman/listinfo/users

     =


_______________________________________________

Users mailing list

Use=
rs(a)ovirt.org <mailto:Users(a)ovirt.org>

http://lists.ovirt.org/mailman/listinfo/users


------------------------------------------------------------------------
This is a PRIVATE message. If you are not the intended recipient, please
delete without copying and kindly advise us by e-mail of the mistake in
delivery. NOTE: Regardless of content, this e-mail shall not operate to
bind SKOPOS to any order or other contract unless pursuant to explicit
written agreement or government initiative expressly permitting the use
of e-mail for such purpose.
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