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

Cesar Peschiera brain at click.com.py
Thu Nov 20 10:29:07 CET 2014


> 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. 




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