[PVE-User] Ceph Bluestore - lvmcache versus WAL/DB on SSD

Lindsay Mathieson lindsay.mathieson at gmail.com
Wed Jul 1 01:49:24 CEST 2020


On 30/06/2020 11:12 pm, Mark Schouten wrote:
> Could be that (deep) scrubs are periodically killing your performance.
> There are some tweaks available to make them less invading:
>
> osd_scrub_chunk_min=20 # 5
> osd_scrub_sleep=4 # 0

Thanks, I don't think its deep scrub - things seem ok when a scrub is 
running, but I will test it to be sure. Have also been meaning to 
restrict them to after hours.


>
> And then some:
> https://docs.ceph.com/docs/master/rados/configuration/osd-config-ref/
>
> Best option is really to place spinning disks with SSD..


Would love to, alas, SMB budget restrictions. Wanting champagne 
performance on a beer budget :)

-- 
Lindsay



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