Re: [Xen-users] iSCSI-LUN as VBD

[Ming Zhang <mingz@xxxxxxxxxxx>]

feel curious, have u ever tried live migration with an iscsi vbd? thx.

ming

On Tue, 2006-05-23 at 13:19 +0100, Matthew Wild wrote:
> On Tuesday 23 May 2006 13:02, Tijl Van den Broeck wrote:
> > On 5/23/06, Matthew Wild <M.Wild@xxxxxxxx> wrote:
> > > I have iSCSI vbd based domUs working in SuSE10.1, xen-3.0.2 and
> > > open-iscsi-0.5.545-9 against an IET server.
> >
> > What system do you have ? I used the standard suse 10.1 pkgs on a x86_64
> > system but open-iscsi-0.5.545 caused a crash on the iscsi modules. iSCSI
> > didn't work until I manually compiled and installed the lastest open-iscsi
> > sources.
> >
> I have a dual dual-core Opteron box. 
> 
> > where /dev/disk/by-id/scsi-0049003c... would represent /dev/sdc for the
> > domU
> >
> > > root space and /dev/disk/by-id/scsi-0049005a... would represent /dev/sdd
> > > for
> > > the domU swap space and are individual disks as seen by the dom0. I'm
> > > using
> > > the /dev/disk/by-id names for each disk as these are unique names as seen
> > > by
> > > all iSCSI initiators and allow me to migrate live domUs between physical
> > > dom0s.
> >
> > To perform live migration, do you have a separate iscsi target server or
> > can one use one of the dom0's? I want to test live migration with 2 dom0's,
> > one has a large disk attached to it which I want to use for the iSCSI
> > target. But if I try to connect to the iSCSI shares on both dom0's at the
> > same time... the  dom0 with the large disk hangs.
> >
> I am using a separate target server - as in a large ~6T storage server using 
> IET to provide a pile of LUNs. I have seen some comments on the open-iscsi 
> list about problems with accessing targets on the same machine in certain 
> circumstances, I'm afraid I can't remember the details as they didn't apply 
> in my situation.
> 
> > Am I doing something wrong here? My impression is/was that both xen's mount
> > the same iscsi drive at the same time when transferring (hence the need for
> > GFS/OCFS2 I've read about in this list), or does one dom0 safely unmount
> > and the other one mounts?
> >
> I don't know about this. I'm only using reiserfs on the connected LUNs and 
> haven't hit any problems yet.
> 
> Matthew


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