[Gluster-users] Settings for VM hosting

[Krutika Dhananjay]

On Fri, Apr 19, 2019 at 12:48 PM <lemonnierk at ulrar.net> wrote:

> On Fri, Apr 19, 2019 at 06:47:49AM +0530, Krutika Dhananjay wrote:
> > Looks good mostly.
> > You can also turn on performance.stat-prefetch, and also set
>
> Ah the corruption bug has been fixed, I missed that. Great !
>
> > client.event-threads and server.event-threads to 4.
>
> I didn't realize that would also apply to libgfapi ?
> Good to know, thanks.
>
> > And if your bricks are on ssds, then you could also enable
> > performance.client-io-threads.
>
> I'm surprised by that, the doc says "This feature is not recommended for
> distributed, replicated or distributed-replicated volumes."
> Since this volume is just a replica 3, shouldn't this stay off ?
> The disks are all nvme, which I assume would count as ssd.
>

They're not recommended if you're using slower disks (HDDs for instance)
as it can increase the number of fsyncs triggered by replicate module and
their slowness
can degrade performance. With nvme/ssds this should not be a problem and
the net result
of enabling client-io-threads there should be an improvement in perf.

-Krutika


> > And if your bricks and hypervisors are on same set of machines
> > (hyperconverged),
> > then you can turn off cluster.choose-local and see if it helps read
> > performance.
>
> Thanks, we'll give those a try !
>
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