Hi.
I've read in many places that you should never use writeback on any kind
of shared storage. Caching is better dealt with on the storage side
anyway as you have hopefully provided resilience there. In fact if your
SAN/NAS is good enough it's supposed to be best to use "none" as the
caching algo.
If you need caching on the hypervisor side it would probably better to
use something like bcache/dmcache etc.
Cheers
Alex
On 12/04/14 16:01, Alexandre DERUMIER wrote:
Hello,
I known that qemu live migration with disk with cache=writeback are not safe
with storage like nfs,iscsi...
Is it also true with rbd ?
If yes, it is possible to disable manually writeback online with qmp ?
Best Regards,
Alexandre
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