On 07/11/2013 02:45 PM, Piotr Szubiakowski wrote:
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.
Thanks Yuri,
Is fencing handled by the cman/pacemaker? I read about the fanced
daemon and it seems to be difficult to use it together with oVirt.
Piotr
yea, fencing handled by pacemaker, stonith resource fence_rhev -
parameters according to man page, with one exception - had to add
/pcmk_host_list="vmname" /additional parameter, so pacemaker would
know that this stonith device belongs to that VM.
It's great news for me!
Many thanks,
Piotr
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