Hi,
I have a ceph cluster with 26 osd's in 4 hosts only use for rbd for an OpenStack cluster (started at 0.48 I think), currently running 0.94.2 on Ubuntu 14.04. A few days ago one of the osd's was at 85% disk usage while only 30% of the raw disk space is used. I ran reweight-by-utilization with 150 was cutoff level. This reshuffled the data. I also noticed that the number of pg was still at the level when there were less disks in the cluster (1300).
Based on the current guidelines I increased pg_num to 2048. It created the placement groups except for the last one. To try to force the creation of the pg I removed the OSD's (ceph osd out) assigned to that pg but that makes no difference. Currently all OSD's are back in and two pg's are also stuck in an unclean state:
ceph health detail:
HEALTH_WARN 2 pgs degraded; 2 pgs stale; 2 pgs stuck degraded; 1 pgs stuck inactive; 2 pgs stuck stale; 3 pgs stuck unclean; 2 pgs stuck undersized; 2 pgs undersized; 59 requests are blocked > 32 sec; 3 osds have slow requests; recovery 221/549658 objects degraded (0.040%); recovery 221/549658 objects misplaced (0.040%); pool volumes pg_num 2048 > pgp_num 1400
pg 5.6c7 is stuck inactive since forever, current state creating, last acting [19,25]
pg 5.6c7 is stuck unclean since forever, current state creating, last acting [19,25]
pg 5.2c7 is stuck unclean for 313513.609864, current state stale+active+undersized+degraded+remapped, last acting [9]
pg 15.2bd is stuck unclean for 313513.610368, current state stale+active+undersized+degraded+remapped, last acting [9]
pg 5.2c7 is stuck undersized for 308381.750768, current state stale+active+undersized+degraded+remapped, last acting [9]
pg 15.2bd is stuck undersized for 308381.751913, current state stale+active+undersized+degraded+remapped, last acting [9]
pg 5.2c7 is stuck degraded for 308381.750876, current state stale+active+undersized+degraded+remapped, last acting [9]
pg 15.2bd is stuck degraded for 308381.752021, current state stale+active+undersized+degraded+remapped, last acting [9]
pg 5.2c7 is stuck stale for 281750.295301, current state stale+active+undersized+degraded+remapped, last acting [9]
pg 15.2bd is stuck stale for 281750.295293, current state stale+active+undersized+degraded+remapped, last acting [9]
16 ops are blocked > 268435 sec
10 ops are blocked > 134218 sec
10 ops are blocked > 1048.58 sec
23 ops are blocked > 524.288 sec
16 ops are blocked > 268435 sec on osd.1
8 ops are blocked > 134218 sec on osd.17
2 ops are blocked > 134218 sec on osd.19
10 ops are blocked > 1048.58 sec on osd.19
23 ops are blocked > 524.288 sec on osd.19
3 osds have slow requests
recovery 221/549658 objects degraded (0.040%)
recovery 221/549658 objects misplaced (0.040%)
pool volumes pg_num 2048 > pgp_num 1400
OSD 9 was the one that was the primary when the pg creation process got stuck. This OSD has been removed and added again (not only osd out but also removed from the crush map and added again)
The bad data distribution was probably caused by the low number of pg's and mainly bad weighing of the OSD. I changed the crush map to give the same weight to each of the OSD's but that does not change these problems either:
ceph osd tree:
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 6.50000 pool default
-6 2.00000 host droplet4
16 0.25000 osd.16 up 1.00000 1.00000
20 0.25000 osd.20 up 1.00000 1.00000
21 0.25000 osd.21 up 1.00000 1.00000
22 0.25000 osd.22 up 1.00000 1.00000
6 0.25000 osd.6 up 1.00000 1.00000
18 0.25000 osd.18 up 1.00000 1.00000
19 0.25000 osd.19 up 1.00000 1.00000
23 0.25000 osd.23 up 1.00000 1.00000
-5 1.50000 host droplet3
3 0.25000 osd.3 up 1.00000 1.00000
13 0.25000 osd.13 up 1.00000 1.00000
15 0.25000 osd.15 up 1.00000 1.00000
4 0.25000 osd.4 up 1.00000 1.00000
25 0.25000 osd.25 up 1.00000 1.00000
14 0.25000 osd.14 up 1.00000 1.00000
-2 1.50000 host droplet1
7 0.25000 osd.7 up 1.00000 1.00000
1 0.25000 osd.1 up 1.00000 1.00000
0 0.25000 osd.0 up 1.00000 1.00000
9 0.25000 osd.9 up 1.00000 1.00000
12 0.25000 osd.12 up 1.00000 1.00000
17 0.25000 osd.17 up 1.00000 1.00000
-4 1.50000 host droplet2
10 0.25000 osd.10 up 1.00000 1.00000
8 0.25000 osd.8 up 1.00000 1.00000
11 0.25000 osd.11 up 1.00000 1.00000
2 0.25000 osd.2 up 1.00000 1.00000
24 0.25000 osd.24 up 1.00000 1.00000
5 0.25000 osd.5 up 1.00000 1.00000
I also restarted all OSD's and monitors several times, but no change. The pool for which the pg is stuck, has replication level 2. I ran out of things to try. Anyone else something I can try?
gr,
Bart
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