Re: [Users] ovirt / 2 iscsi storage domains / same LUN IDs
----- Original Message -----
Hi there,
I was doing some testing around ovirt and iscsi and found an issue
where as when you use "dd" to create "backing-stores" for iscsi and
you point ovirt to it to discover & login, it thinks the LUN ID is
the same although the target is different and adds additional paths
to the config (automagically?) bringing down the iSCSI storage
domain.
There is no question about the behaviour, it's not a bug, that is the way multipathing
works (has nothing to do with oVirt). The GUID of a LUN has to be unique. multipathd
seeing the same LUN ID across multiple targets assumes that it's the same LUN with
multiple paths and that's how you get redundancy and load balancing.
Why tgtd doesn't take care of this built in I could never grok, but what you need to
do is edit your targets.conf and add the scsi_id and scsi_sn fields.
Example:
<target MasterBackup>
allow-in-use yes
<backing-store /dev/vg0/MasterBackup>
lun 1
scsi_id MasterBackup
scsi_sn 444444444401
</backing-store>
</target>
See attached screenshot of what I got when trying to a "new iscsi san
storage domain" to ovirt. The Storage Domain is now down and I
cannot get rid of the config (???) how do I force it to logout of
the targets ??
Also, anyone know how to deal with the duplicate LUN ID issue ?
Thanks
Alex
--
| RHCE | Senior Systems Engineer | www.vcore.co |
| www.vsearchcloud.com |
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