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Re: [Xen-users] Xen and GFS

The setup I have is 3 - AMD_64DP server blades w/ 4Gb RAM each, attached to FC SAN. The thought was that I would create a GFS volume on the SAN, mount it under Xen dom0 on all 3 blades, create all the VBDs for my VMs on the SAN, and thus be able to easily migrate VMs from one blade to another, without any intermediary mounts and unmounts on the blades. I thought it made a lot of sense, but maybe my approach is wrong.

On Apr 18, 2006, at 1:00 PM, John Madden wrote:

Does anyone have any pointers with regard to using Xen and storing
VBDs on a GFS volume under dom0? This sounds like it should work
well, especially for migrating domains, but it looks as though GFS
won't allow a read-write mount of a loop device (file) so I end up
with read only VBDs on the SAN, which are obviously useless. Maybe my
approach is completely off, but it sounded pretty good up until I
discovered the lock problem. FYI, the gfs error when mounting is
listed below.

Sorry to not actually help, but what do you need GFS for if you have a SAN? You can't have multiple copies of the same domU writing to the lun at once,
so what purpose does a cluster filesystem serve?


John Madden
Sr. UNIX Systems Engineer
Ivy Tech Community College of Indiana

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