There’s nothing special about our setup really. I’m also open to test
any alternative if it improves our user experience. So it would
probably make sense to check out the performance meeting you
mentioned. :-)
Zitat von Mark Nelson <mnelson@xxxxxxxxxx>:
Hi Eugen,
Thanks for the great feedback. Is there anything specific about the
cache tier itself that you like vs hypothetically having caching
live below the OSDs? There are some real advantages to the cache
tier concept, but eviction over the network has definitely been one
of the tougher aspects of how it works (imho) compared with block
level caching.
Mark
On 2/16/22 10:18, Eugen Block wrote:
Hi,
we've noticed the warnings for quite some time now, but we're big
fans of the cache tier. :-)
IIRC we set it up some time around 2015 or 2016 for our production
openstack environment and it works nicely for us. We tried it
without the cache some time after we switched to Nautilus but the
performance was really bad, so we enabled it again. Of course, one
could argue that we could just use SSD OSDs for the cached pool,
too. But since the cache works fine we don't find it necessary to
rebuild the entire pool with larger SSDs.
We're currently sill on Nautilus, we want to upgrade to Octopus
soon. But I think we would vote for keeping the cache tier. :-)
Regards,
Eugen
Zitat von Neha Ojha <nojha@xxxxxxxxxx>:
Hi everyone,
We'd like to understand how many users are using cache tiering and in
which release.
The cache tiering code is not actively maintained, and there are known
performance issues with using it (documented in
https://docs.ceph.com/en/latest/rados/operations/cache-tiering/#a-word-of-caution). We are wondering if we can deprecate cache tiering sometime
soon.
Thanks,
Neha
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Eugen Block
NDE Netzdesign und -entwicklung AG voice: +49 40 5595175
Postfach 61 03 15 e-mail: eblock@xxxxxx
D-22423 Hamburg
Vorstand: Jens-U. Mozdzen
Aufsichtsratsvorsitzende: Angelika Torlée-Mozdzen
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