On 01/03/2017 11:33 AM, Dhaussy Alexandre wrote:
Hello,
I just spotted something strange with storage cache mode.
I set cache=none on all my VMs (i believe this is the default), however
qm monitor says "writeback, direct".
Am i missing something ?
from the kvm manpage:
The host page cache can be avoided entirely with cache=none. This will
attempt to do disk IO directly to the guest's memory.
QEMU may still perform an internal copy of the data. Note
that this is considered a writeback mode and the guest OS must handle
the disk write cache correctly in order to avoid data
corruption on host crashes.
so cache=none is considered a writeback mode and this is represented by
writeback, direct
if you select writeback mode for a disk it shows only
writeback
so i think this is correct
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