On 07/11/2013 12:52 PM, Piotr Szubiakowski wrote:
The way that oVirt manage storage domains accessed via FC is very
smart.
There is separate logical volume for each virtual disk. But I think
that
logical volume at the same time could be "touched" only by one host. Is
it possible that two host access read/write the same logical volume and
there is no data corruption?
hence a shared disk over block storage using LVM must be
pre-allocated, so no LV changes (lv extend) would be needed.
(also, it cannot have snapshots, since it would become qcow)
Ok, but this is the hypervisor view. For a guest OS this LV is normal
RAW block device. I wonder if someone test this feature and access
shared disk from many VM's at the same time?
I did a brief tests - 3 vms, shared disk, cman/pacemaker + gfs2 - had no
problems using it, no data corruption. although that was only basic
tests, like create/move/delete files, no extensive usage/stress or
something like that.
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