22 Mar
2023
22 Mar
'23
5:10 p.m.
2) .mgr pool
2.1) I have become really tired of these administrative pools that are created on the fly
without any regards to device classes, available capacity, PG allocation and the like. The
first one that showed up without warning was device_health_metrics, which turned the
cluster health_err right away because the on-the-fly pool creation is, well, not exactly
smart.
We don't even have drives below the default root. We have a lot of different pools on
different (custom!) device classes with different replication schemes to accommodate a
large variety of use cases. Administrative pools showing up randomly somewhere in the tree
are a real pain. There are ceph-user cases where people deleted and recreated it only to
make the device health module useless, because it seems to store the pool ID and there is
no way to tell it to use the new pool.
Ah, that's why it looked unused after I also had to remake it. Since
it gets created when you don't have the OSDs yet, the possibilities
for it ending up wrong seem very large.
--
May the most significant bit of your life be positive.