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

[Matthew Wild <M.Wild@xxxxxxxx>]

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
-- 
Matthew Wild                       Tel.: +44 (0)1235 445173
M.Wild@xxxxxxxx                    URL http://www.ukssdc.ac.uk/
UK Solar System Data Centre and
World Data Centre - Solar-Terrestrial Physics, Chilton
Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users