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 > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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