From demchenko.ya at gmail.com Wed Apr 3 07:47:52 2013 Content-Type: multipart/mixed; boundary="===============1026876328806994527==" MIME-Version: 1.0 From: Yuriy Demchenko To: users at ovirt.org Subject: Re: [Users] way to edit iSCSI storage domain? Date: Wed, 03 Apr 2013 13:49:41 +0400 Message-ID: <515BFB35.40102@gmail.com> In-Reply-To: CAH4_GUvgqzh+h9vd6mE1TxTxb+bKTVXS1R3_D14OKe+ZvP_5ZA@mail.gmail.com --===============1026876328806994527== 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. --------------010702090104000703040900 Content-Type: text/plain; charset=3DISO-8859-1; format=3Dflowed Content-Transfer-Encoding: 7bit You mean add new path by hands on each node via iscsiadm ? And how that = changes survive possible node reboots / reinstalls, as i suppose - it = wouldn't? In ovirt webadmin i cannot edit added domain - connection information is = greyed out (even when storage domain in maintenance mode) Yuriy Demchenko On 04/03/2013 01:00 PM, Alex Leonhardt wrote: > I think i'd just add the 2nd path when the device is available ... = > i've recently exprimented with iscsi / tgtd and multipath on a ovirt = > hyper-visor and it will identify the disk as "the same" (new path to = > target) as long as the LUN ID is the same (this is taken from = > experience, not from a spec document) ... > > > On 3 April 2013 08:14, Yuriy Demchenko > wrote: > > I guess you misunderstood me > I'm going to try this scheme: > |STORAGE| > FC / \ > |SERV1/tgtd| |SERV2/tgtd| > iSCSI \ / > |ethernet switches| > iSCSI |||||||| > |blades|blades|blades| > > serv1/serv2 - connectivity isnt a problem, multipathed FC scheme, > all good. Same lun accessible for both servers and than exported > via tgtd to iSCSI: with different target names > ("iqn.2013-03.serv1:store", "iqn.2013-03.serv2:store"), but same > vendor_id, product_id, scsi_sn, scsi_id. That way client can login > into both targets and see lun as multipathed device. > And multipath failover scheme (via custom config with > path_grouping_policy=3Dfailover for corresponding > vendor_id/product_id) is on blades-clients - so they use only one > target at time (no round-robin or similar stuff), but with ability > to switch to another target in case one of serv1/serv2 is down. > > However, in my case "serv2" would not be available during oVirt > setup (need to setup ovirt and virtual servers to move stuff > first), so i cant enter both targets on storage domain > initialization - that's why I'm asking if there's any way to edit > storage domain details after initialization without destroying it > (maybe directly via sql or something). > > Yuriy Demchenko > > > On 04/02/2013 06:26 PM, Shu Ming wrote: > > I am not sure if the multipathd can recognize the FC path to > the storage when the second server is available and regards it > as the same as the iSCSI path used before. If it is not, I > think the device under /dev/mapper may change when you cut the > iSCSI path off and then enable FC path. That will definitely > corrupt the meta data of the volume group which the storage > domain is sitting on and the storage domain will be corrupted > finally. > > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > > > > -- = > | RHCE | Sen Sys Engineer / Platform Architect | www.vcore.co = > | www.vsearchcloud.com = > | --------------010702090104000703040900 Content-Type: text/html; charset=3DISO-8859-1 Content-Transfer-Encoding: 7bit

You mean add new path by hands on each node via iscsiadm ? And how that changes survive possible node reboots / reinstalls, as i suppose - it wouldn't?
In ovirt webadmin i cannot edit added domain - connection information is greyed out (even when storage domain in maintenance mode)

Yuriy Demchenko

On 04/03/2013 01:00 PM, Alex Leonhardt wrote:

I think i'd just add the 2nd path when the device is available ... i've recently exprimented with iscsi / tgtd and multipath on a ovirt hyper-visor and it will identify the disk as "the same" (new path to target) as long as the LUN ID is the same (this is taken from experience, not from a spec document) ...

On 3 April 2013 08:14, Yuriy Demchenko <de= mchenko.ya(a)gmail.com> wrote:

I guess you misunderstood me
I'm going to try this scheme:
|STORAGE= |
FC / &n= bsp; \
|SERV1/tgtd| |SERV2/tgtd|
iSCSI \ = /
|ethernet switches|
iSCSI ||||||||
|blades|blades|blades|

serv1/serv2 - connectivity isnt a problem, multipathed FC scheme, all good. Same lun accessible for both servers and than exported via tgtd to iSCSI: with different target names ("iqn.2013-03.serv1:store", "iqn.2013-03.serv2:store"), but same vendor_id, product_id, scsi_sn, scsi_id. That way client can login into both targets and see lun as multipathed device.
And multipath failover scheme (via custom config with path_grouping_policy=3Dfailover for corresponding vendor_id/product_id) is on blades-clients - so they use only one target at time (no round-robin or similar stuff), but with ability to switch to another target in case one of serv1/serv2 is down.

However, in my case "serv2" would not be available during oVirt setup (need to setup ovirt and virtual servers to move stuff first), so i cant enter both targets on storage domain initialization - that's why I'm asking if there's any way to edit storage domain details after initialization without destroying it (maybe directly via sql or something).

Yuriy Demchenko

On 04/02/2013 06:26 PM, Shu Ming wrote:

I am not sure if the multipathd can recognize the FC path to the storage when the second server is available and regards it as the same as the iSCSI path used before. If it is not, I think the device under /dev/mapper may change when you cut the iSCSI path off and then enable FC path. That will definitely corrupt the meta data of the volume group which the storage domain is sitting on and the storage domain will be corrupted finally.

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

--

| RHCE | Sen Sys Engineer / Platform Architect | www.vcore.co | www.vsearchcloud.com |

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