ceph_note.txt

###############################
### unknown and inactive pg ###
###############################
ceph health detail
HEALTH_WARN Reduced data availability: 1 pg inactive; 2 slow ops, oldest one blocked for 960 sec, osd.2 has slow ops
[WRN] PG_AVAILABILITY: Reduced data availability: 1 pg inactive
    pg 1.0 is stuck inactive for 51m, current state unknown, last acting []

ceph pg dump_stuck
PG_STAT  STATE    UP  UP_PRIMARY  ACTING  ACTING_PRIMARY
1.0      unknown  []          -1      []              -1

ceph osd force-create-pg 1.0 --yes-i-really-mean-it

#########################
### undersized+peered ###
#########################
ceph pg stat
49 pgs: 1 undersized+peered, 48 active+clean; 17 KiB data, 796 MiB used, 91 GiB / 92 GiB avail; 852 B/s rd, 1 op/s

## If the replication size is higher than the number of available OSDs, you need to either increase the number of OSDs or reduce the replication size:
ceph osd pool get .mgr size
10
ceph osd pool set .mgr size 3