[Users] which file system for shared disk?

[Itamar Heim]

On 07/11/2013 11:52 AM, 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?

it was tested, but it has to be RAW/pre-allocated or either LV metadata 
changes or qcow changes need to be changed in more than a single host.