Hi,
# ceph health detail
HEALTH_WARN too few PGs per OSD (24 < min 30)
TOO_FEW_PGS too few PGs per OSD (24 < min 30)
ceph version 14.2.9
This warning popped up when autoscale shrunk a pool from pg_num and pgp_num
from 512 to 256 on its own. The hdd35 storage is only used by this pool.
I have three different storage classes and the pools use the different classes
as appropriate. How can I convert the warning into something useful which then
helps me make the appropriate change to the right class of storage? I'm
guessing it's referring to hdd35.
RAW STORAGE:
CLASS SIZE AVAIL USED RAW USED %RAW USED
hdd25 129 TiB 83 TiB 46 TiB 46 TiB 35.87
hdd35 269 TiB 220 TiB 49 TiB 49 TiB 18.12
ssd 256 TiB 164 TiB 92 TiB 92 TiB 35.84
TOTAL 655 TiB 468 TiB 186 TiB 187 TiB 28.56
If I follow:
https://docs.ceph.com/en/latest/rados/operations/health-checks/#too-few-pgs
Which then links to:
https://docs.ceph.com/en/latest/rados/operations/placement-groups/#choosing-number-of-placement-groups
The math for this would want the pool to have pg/p_num of 2048 -- where
autoscale just recently shrunk the count. Which is more right?
Thanks!
peter
Peter Eisch
Senior Site Reliability Engineer
T1.612.445.5135
virginpulse.com
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