[pve-devel] Enable trim discard support for rbd

[Dietmar Maurer]

> I want to enable trim support rbd see:
> http://ceph.com/docs/master/rbd/qemu-rbd/#enabling-discard-trim
> 
> I think we can generally enable it it doesn't harm.
> 
> Where can we do this?(which function)

That seem to be a highly experimental feature - only used by ide and scsi block driver, and 
discard_granularity has hardoced limits, and is not really documented :-/