Re: Ceph OSD journal utilization

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For automatically collecting stats like this you might also look into
collectd.  It has many plugins for different system statistics
including one for collecting stats from Ceph daemon admin sockets.
There are several ways to collect and view the data from collectd.  We
are pointing clients at Influxdb and then viewing with Grafana.  There
are many small tutorials on this combination of tools if you google
and the docs for the tools cover how to configure each end.

In particular this plugin will get disk utilization counters:
https://collectd.org/wiki/index.php/Plugin:Disk

This combination is how we are monitoring OSD journal utilization
among other things.

thanks,
Ben





On Mon, Jun 20, 2016 at 12:02 PM, David Turner
<david.turner@xxxxxxxxxxxxxxxx> wrote:
> If you want to watch what a disk is doing while you watch it, use iostat on
> the journal device.  If you want to see it's patterns at all times of the
> day, use sar.  Neither of these are ceph specific commands, just Linux tools
> that can watch your disk utilization, speeds, etc (among other things.  Both
> tools are well documented and easy to use.
> ________________________________
> From: ceph-users [ceph-users-bounces@xxxxxxxxxxxxxx] on behalf of EP Komarla
> [Ep.Komarla@xxxxxxxxxxxxxxx]
> Sent: Friday, June 17, 2016 5:13 PM
> To: ceph-users@xxxxxxxxxxxxxx
> Subject:  Ceph OSD journal utilization
>
> Hi,
>
>
>
> I am looking for a way to monitor the utilization of OSD journals – by
> observing the utilization pattern over time, I can determine if I have over
> provisioned them or not. Is there a way to do this?
>
>
>
> When I googled on this topic, I saw one similar request about 4 years back.
> I am wondering if there is some traction on this topic since then.
>
>
>
> Thanks a lot.
>
>
>
> - epk
>
>
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