[libvirt] [PATCH] virstoragefile: identify GPFS as cluster FS

[Michal Privoznik]

On 2/27/19 3:07 PM, Diego Michelotto wrote:
> GPFS is 'IBM General Parallel File System', also called
> 'IBM Spectrum Scale', stalls when a process issues a lot
> of fsyncs in a short timeframe.
> 
> It is better if the VM I/O is not synchronous.
> It is racommended to use writeback caching policy.

Using writeback may lead to a data loss if qemu is killed on destination 
and underlying FS has not synced the data. Since I don't have GPFS I 
can't confirm it's behaving safely on migration. And I wasn't fortunate 
finding that on the internet either.

Michal