Hi,
some more details would be helpful, for example what's the pool size
of the cache pool? Did you issue a PG split before or during the
upgrade? This thread [1] deals with the same problem, the described
workaround was to set hit_set_count to 0 and disable the cache layer
until that is resolved. Afterwards you could enable the cache layer
again. But keep in mind that the code for cache tier is entirely
removed in Reef (IIRC).
Regards,
Eugen
[1]
https://ceph-users.ceph.narkive.com/zChyOq5D/ceph-strange-issue-after-adding-a-cache-osd
Zitat von Cedric <yipikai7@xxxxxxxxx>:
Hello,
Following an upgrade from Nautilus (14.2.22) to Pacific (16.2.13), we
encounter an issue with a cache pool becoming completely stuck,
relevant messages below:
pg xx.x has invalid (post-split) stats; must scrub before tier agent
can activate
In OSD logs, scrubs are starting in a loop without succeeding for all
pg of this pool.
What we already tried without luck so far:
- shutdown / restart OSD
- rebalance pg between OSD
- raise the memory on OSD
- repeer PG
Any idea what is causing this? any help will be greatly appreciated
Thanks
Cédric
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