Re: [Users] ovirt / 2 iscsi storage domains / same LUN IDs

Hi, I just tested this with this config : <target iqn.2013-02.local.vm:iscsi.lun1> <backing-store /vol/scsi.img> vendor_id ISCSI-MULTIPATH scsi_id MULTIPATHTEST scsi_sn 990000100001 lun 1 </backing-store> </target> However, upon discovery / login, the LUN ID was again : 1IET_0000100001 Alex On 3 March 2013 18:34, Ayal Baron <abaron(a)redhat.com&gt; wrote: > > > ----- 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 | > > > > _______________________________________________ > > Users mailing list > > Users(a)ovirt.org > > http://lists.ovirt.org/mailman/listinfo/users > > > -- | RHCE | Senior Systems Engineer | www.vcore.co | www.vsearchcloud.com |