I found an older ML entry from 2015 and not much else, mostly detailing the
doing performance testing to dispel poor performance numbers presented by OP.
Currently have the metadata pool on my slow 24 HDDs, and am curious if I should
see any increased performance with CephFS by moving the metadata pool onto SSD
medium.
My thought is that the SSDs are lower latency, and it removes those iops from
the slower spinning disks.
My next concern would be write amplification on the SSDs. Would this thrash the
SSD lifespan with tons of little writes or should it not be too heavy of a
workload to matter too much?
My last question from the operations standpoint, if I use:
# ceph osd pool set fs-metadata crush_ruleset <ssd ruleset>
Will this just start to backfill the metadata pool over to the SSDs until it
satisfies the crush requirements for size and failure domains and not skip a
beat?
Obviously things like enabling dirfrags, and multiple MDS ranks will be more
likely to improve performance with CephFS, but the metadata pool uses very
little space, and I have the SSDs already, so I figured I would explore it as
an option.
Thanks,
Reed
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