[ovirt-users] vdsm changing disk scheduler when starting, configurable?

[Yaniv Kaul]

On Mon, Jul 3, 2017 at 12:27 AM, Darrell Budic <budic at onholyground.com>
wrote:

> It seems vdsmd under 4.1.x (or something under it’s control) changes the
> disk schedulers when it starts or a host node is activated, and I’d like to
> avoid this. Is it preventable? Or configurable anywhere? This was probably
> happening under earlier version, but I just noticed it while upgrading some
> converged boxes today.
>
> It likes to set deadline, which I understand is the RHEL default for
> centos 7 on non SATA disks. But I’d rather have NOOP on my SSDs because
> SSDs, and NOOP on my SATA spinning platters because ZFS does it’s own
> scheduling, and running anything other than NOOP can cause increased CPU
> utilization for no gain. It’s also fighting ZFS, which tires to set NOOP on
> whole disks it controls, and my kernel command line setting.
>

We've stopped doing it in 4.1.1 (
https://bugzilla.redhat.com/show_bug.cgi?id=1381219 )
Y.


>
> Thanks,
>
>   -Darrell
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