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... Zitat von Cedric <yipikai7@gmail.com>:

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 _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io