[pve-devel] Default cache mode for VM hard drives

[Cesar Peschiera]

> Cache=none means no host cache but backend cache is still in use. In case
> of DRBD this is a buffer in DRBD. So O_DIRECT return OK when data
> reaches this buffer and not RAID cache.

I forgot to ask you if you have configured the I/O Scheduler as "deadline" 
in PVE, and "noop" for your Linux VMs, this combination is very important.