Re: octopus rbd cluster just stopped out of nowhere (>20k slow ops)

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Hello together,

@Alex: I am not sure for what to look in /sys/block/<dev>/device
There are a lot of files.Is there anything I should check in particular?

You have sysfs access in /sys/block/<device>/device - this will show a lot
> of settings.  You can go to this directory on CentOS vs. Ubuntu, and see if
> any setting is different?
>

@Matthias: yes the kernel is an old one (3.10.0-1160.76.1.el7.x86_64)
The await values are not significantly different (something 0.2 and 3 for
read and 0.1 and 0.4 for write)

> I guess Centos7 has a rather old kernel. What are the kernel versions on
> these hosts?
>
> I have seen a drastic increase in iostat %util numbers on a Ceph cluster
> on Ubuntu hosts, after an Ubuntu upgrade 18.04 => 20.04 => 22.04
> (upgrading Ceph along with it).  iostat %util was up high since, but
> iostat latency values dropped considerably. As the the cluster seemed
> slightly faster overall after these upgrades, I did not worry much about
> increased %util numbers.
>


@Anthony: Thanks for the link. Very nice read.

> https://brooker.co.za/blog/2014/07/04/iostat-pct.html
>
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