Hi,
I just looked into one customer cluster that we upgraded some time ago
from Octopus to Quincy (17.2.6) and I'm wondering why there are still
both pools, "device_health_metrics" and ".mgr".
According to the docs [0], it's supposed to be renamed:
Prior to Quincy, the devicehealth module created a
device_health_metrics pool to store device SMART statistics. With
Quincy, this pool is automatically renamed to be the common manager
module pool.
Now only .mgr has data while device_health_metrics is empty, but it
has a newer ID:
ses01:~ # ceph df | grep -E "device_health|.mgr"
.mgr 1 1 68 MiB 18 204 MiB
0 254 TiB
device_health_metrics 15 1 0 B 0 0 B
0 254 TiB
On a test cluster (meanwhile upgraded to latest Reef) I see the same:
ceph01:~ # ceph df | grep -E "device_health_metrics|.mgr"
.mgr 38 1 577 KiB 2 1.7 MiB 0
71 GiB
device_health_metrics 45 1 0 B 0 0 B 0
71 GiB
Since there are still many users who haven't upgraded to >= Quincy
yet, this should be clarified/fixed. I briefly checked
tracker.ceph.com, but didn't find anything related to this. I'm
currently trying to reproduce it on a one-node test cluster which I
upgraded from Pacific to Quincy, but no results yet, only that the
renaming was successful. But for the other clusters I don't have
enough logs to find out how/why the device_health_metrics pool had
been recreated.
Thanks,
Eugen
[0] https://docs.ceph.com/en/latest/mgr/administrator/#module-pool
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