Re: Ceph performance optimization with SSDs

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On 22.10.21 11:29, Mevludin Blazevic wrote:
> Dear Ceph users,
> 
> I have a small Ceph cluster where each host consist of a small amount of SSDs and a larger number of HDDs. Is there a way to use the SSDs as performance optimization such as putting OSD Journals to the SSDs and/or using SSDs for caching?


Hi,

yes, SSDs can be put to good use as journal devices[0] for OSDs, or you could use them as caching devices for bcache[1]. This is actually a pretty widespread setup, theres docs for various scenarios[2][3]

But be aware that OSD journals are pretty write-intense, so be sure to use fast, reliable SSDs (or NVMes). I have actually seen OSD performance (esp. latency and jitter) actually worsen with (prosumer-grade) SSDs that could not support the sustained write load.

If at all in doubt run tests before putting prod on it


[0] https://docs.ceph.com/en/latest/start/hardware-recommendations/
[1] https://bcache.evilpiepirate.org/
[2] https://charmhub.io/ceph-osd
[3] https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/4/html/object_gateway_for_production_guide/using-nvme-with-lvm-optimally

> Best regards,
> Mevludin
> 
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