Cache Tiering not flushing and evicting due to missing scrub

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Hi,

increasing pg_num for a cache pool gives you a warning, that pools must be scrubed afterwards.

Turns out If you ignore this flushing and evicting will not work.

You realy should do something like this:

for pg in $(ceph pg dump | awk '$1 ~ "^<pool-id>." { print $1 }'); do ceph pg scrub $pg; done

After just a few seconds my pool started flushing and evicting again.

Micha Krause
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