No subject
Sun Jan 20 21:10:45 EST 2013
elated to networking. The VMs will keep running w/o the engine available, y=
ou're simply unable to add/remove/failover VMs, etc. The VDSM running on th=
e host will be unable to get instructions to "kill" any VMs as the engine i=
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
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:"C=
alibri","sans-serif"; color:#1F497D">Ah, thank you much lior=
and alex.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:"C=
alibri","sans-serif"; color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:"C=
alibri","sans-serif"; color:#1F497D">I believe this also ans=
wers 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 vacatio=
n).</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:"C=
alibri","sans-serif"; color:#1F497D"> </span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:"C=
alibri","sans-serif"; color:#1F497D">Thanks again!</span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:"C=
alibri","sans-serif"; color:#1F497D">jonathan</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:"C=
alibri","sans-serif"; color:#1F497D"> </span></p>
<div>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt; font-family:&quo=
t;Tahoma","sans-serif"; color:windowtext">From:</span></b><s=
pan style=3D"font-size:10.0pt; font-family:"Tahoma","sans-se=
rif"; color:windowtext"> Alex Leonhardt [mailto:alex.tuxx at gmail.com]
<br>
<b>Sent:</b> Sunday, March 24, 2013 7:40 AM<br>
<b>To:</b> Lior Vernia<br>
<b>Cc:</b> Jonathan Horne; users at ovirt.org<br>
<b>Subject:</b> Re: [Users] rebooting physical network that ovirt is attach=
ed to</span></p>
</div>
</div>
<p class=3D"MsoNormal"> </p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt; font-family:"T=
ahoma","sans-serif"">From experience, I would shutdown the o=
virt 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 unab=
le to get instructions to "kill" any VMs as the engine is already=
"down" :) ...
<br>
<br>
hope it helps!<br>
alex<br>
<br>
<br>
<br>
</span><br>
On 03/24/2013 10:04 AM, Lior Vernia wrote: </p>
<pre>Hello Jonathan,</pre>
<pre> </pre>
<pre>First of all let me apologize for not being more responsive, seems lik=
e</pre>
<pre>you got the worse end of time difference.</pre>
<pre> </pre>
<pre>Now, in case the question is still relevant:</pre>
<pre> </pre>
<pre>1. Rebooting the first switch won't cause any damage. The VMs will los=
e</pre>
<pre>connectivity on the VLANs, but they should still be manageable through=
</pre>
<pre>oVirt and run normally on their hosts.</pre>
<pre> </pre>
<pre>2. Rebooting the second one could prove more troublesome. Firstly, as =
a</pre>
<pre>preemptive measure I would advise that you not have any VMs running on=
</pre>
<pre>your host marked as SPM at the moment of reboot, if possible - there's=
</pre>
<pre>risk that VMs running on your SPM will be shut down violently when it<=
/pre>
<pre>loses connectivity (or the moment it regains connectivity). Also, if a=
ny</pre>
<pre>of your VMs have thin provisioning defined and they exhaust their</pre=
>
<pre>storage during downtime, they'll run into trouble; but as far as I kno=
w</pre>
<pre>they should be okay if they're not running processes that can suddenly=
</pre>
<pre>demand a lot more storage. That's as far as possible damage goes.</pre=
>
<pre>Besides that, when the switch comes back up, some components (host, da=
ta</pre>
<pre>domain) might appear as non-operational or down, and you might have to=
</pre>
<pre>reactivate them manually from the webadmin console.</pre>
<pre> </pre>
<pre>Hope this helps.</pre>
<pre> </pre>
<pre>Yours, Lior Vernia.</pre>
<pre> </pre>
<pre>On 21/03/13 20:42, Jonathan Horne wrote:</pre>
<blockquote style=3D"margin-top:5.0pt; margin-bottom:5.0pt">
<pre>greetings,</pre>
<pre> </pre>
<pre>we are talking about possibly upgrading our cisco gear tonight, and th=
is</pre>
<pre>will affect our ovirt environment.</pre>
<pre> </pre>
<pre>what can i expect if i were to reboot first the switch that all VMgues=
t</pre>
<pre>VLANs are going thru, ad then afterwards rebooting the switch that all=
</pre>
<pre>ovirtmgmt connections are in? how will the ovirt environment beh=
ave</pre>
<pre>with loss of network connectivity for a couple minutes?</pre>
<pre> </pre>
<pre>the iscsi network is not going to be affected. any information o=
r</pre>
<pre>stories of similar experiences would be appreciated.</pre>
<pre> </pre>
<pre>thanks,</pre>
<pre>jonathan</pre>
<pre> </pre>
<pre> </pre>
<pre>----------------------------------------------------------------------=
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<pre>This is a PRIVATE message. If you are not the intended recipient, plea=
se</pre>
<pre>delete without copying and kindly advise us by e-mail of the mistake i=
n</pre>
<pre>delivery. NOTE: Regardless of content, this e-mail shall not operate t=
o</pre>
<pre>bind SKOPOS to any order or other contract unless pursuant to explicit=
</pre>
<pre>written agreement or government initiative expressly permitting the us=
e</pre>
<pre>of e-mail for such purpose.</pre>
<pre> </pre>
<pre> </pre>
<pre>_______________________________________________</pre>
<pre>Users mailing list</pre>
<pre><a href=3D"mailto:Users at ovirt.org">Users at ovirt.org</a></pre>
<pre><a href=3D"http://lists.ovirt.org/mailman/listinfo/users">http://lists=
.ovirt.org/mailman/listinfo/users</a></pre>
<pre> </pre>
</blockquote>
<pre>_______________________________________________</pre>
<pre>Users mailing list</pre>
<pre><a href=3D"mailto:Users at ovirt.org">Users at ovirt.org</a></pre>
<pre><a href=3D"http://lists.ovirt.org/mailman/listinfo/users">http://lists=
.ovirt.org/mailman/listinfo/users</a></pre>
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