[Users] which file system for shared disk?
Yuriy Demchenko
demchenko.ya at gmail.com
Thu Jul 11 10:15:13 UTC 2013
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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