Hi Marc,
Hi Vitaliy, just saw you recommend someone to use ssd, and wanted to
use
the oppurtunaty to thank you for composing this text[0], enoyed reading
it.
- What do you mean with: bad-SSD-only?
A cluster consisting only of bad SSDs, like desktop ones :) their
latency with fsync is almost like HDDs. For example, a 7200rpm HDD may
give ~120 write iops (~9ms latency) and Samsung 960 evo gives 580 iops
(~1.72ms latency), even though it's an NVMe and it does great without
fsync. In the best (worst?) case the patch reduces disk I/O latency
twice, so it's noticeable only if your disks are slow.
- Is this patch[1] in a Nautilus release?
As I understand it's already backported into Nautilus, Mimic and maybe
even into Luminous but not released yet in any of those.
[0]
https://yourcmc.ru/wiki/Ceph_performance
[1]
https://github.com/ceph/ceph/pull/26909
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