[Users] which file system for shared disk?

[Yuriy Demchenko]

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.