[Users] Storage Performance Issue !

[Gianluca Cecchi]

On Wed, Feb 19, 2014 at 1:45 PM, Sven Kieske  wrote:
> Just as a quick shot:
>
> You really may want to check which IO scheduler runs inside the
> vm. you probably want deadline or noop instead of CFQ, which
> can have a huge performance impact inside the vms.

BTW: actually I'm already doing it (setting scheduler as deadline) at
hypervisor level for my oVirt hosts, even if it seems to me it is not
the default...
What do you think about it? This way a single process (aka vm) cannot
have such huge performance impact and you have nothing to do at VM
level...
Even in recent fedora (19) I see some situations where cfq is
suboptimal in case of heavy I/O operations...

Gianluca