Hello list,
After running cache tiers for years and years, we decided to turn off
caching on a mostly dormant cluster.
Given an installation using Pacific, we followed the instructions as
dictated on:
https://docs.ceph.com/en/pacific/rados/operations/cache-tiering/#removing-a-writeback-cache
So, we set the "hot" tier to cache-mode proxy (as the documentation
mentions) and simply waited for a bit. Since nothing really seemed to
happen, we did a manual flush using cache-flush-evict-all (also as the
documentation mentions). So far, so good.
The end result is a cache tier with still quite some (>81k) objects
within. Running cache-flush-evict-all again renders errors such as:
failed to flush /rbd_data.d9d54166ef438d.0000000000020899: (2) No such
file or directory
rbd_data.d9d54166ef438d.000000000001a511
This is not what is expected.
What are we looking at? And, how to move forward in removing the cache?
Thanks for your help and wisdom!
Cheers,
Kees
P.S. The introduction text speaks of readproxy and not proxy. This
confusing since the instruction text speaks of proxy.
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