On Fri, May 24, 2019 at 3:27 PM Robert Sander <r.sander@xxxxxxxxxxxxxxxxxxx> wrote:
Am 24.05.19 um 14:43 schrieb Paul Emmerich:
> 20 MB/s at 4K blocks is ~5000 iops, that's 1250 IOPS per SSD (assuming
> replica 3).
>
> What we usually check in scenarios like these:
>
> * SSD model? Lots of cheap SSDs simply can't handle more than that
The system has been newly created and is not busy at all.
We tested a single SSD without OSD on top with fio: it can do 50K IOPS
read and 16K IOPS write.
If you tell us the disk model someone here might be able to share their
experiences with that disk.
Paul
--
Paul Emmerich
Looking for help with your Ceph cluster? Contact us at https://croit.io
croit GmbH
Freseniusstr. 31h
81247 München
www.croit.io
Tel: +49 89 1896585 90
Paul Emmerich
Looking for help with your Ceph cluster? Contact us at https://croit.io
croit GmbH
Freseniusstr. 31h
81247 München
www.croit.io
Tel: +49 89 1896585 90
> * Get some proper statistics such as OSD latencies, disk IO utilization,
> etc. A benchmark without detailed performance data doesn't really help
> to debug such a problem
Yes, that is correct, we will try to setup a perfdata gathering system.
Regards
--
Robert Sander
Heinlein Support GmbH
Linux: Akademie - Support - Hosting
http://www.heinlein-support.de
Tel: 030-405051-43
Fax: 030-405051-19
Zwangsangaben lt. §35a GmbHG:
HRB 93818 B / Amtsgericht Berlin-Charlottenburg,
Geschäftsführer: Peer Heinlein -- Sitz: Berlin
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