I could use some input from more experienced folks…
First time seeing this behavior. I've been running ceph in production
(replicated) since 2016 or earlier.
This, however, is a small 3-node cluster for testing EC. Crush map rules
should sustain the loss of an entire node.
Here's the EC rule:
rule cephfs425 { id 6 type erasure min_size 3 max_size 6 step
set_chooseleaf_tries 40 step set_choose_tries 400 step take default step
choose indep 3 type host step choose indep 2 type osd step emit }
I had actual hardware failure on one node. Interestingly, this appears to
have resulted in data loss. OSDs began to crash in a cascade on other nodes
(i.e., nodes with no known hardware failure). Not a low RAM problem.
I could use some pointers about how to get the down PGs back up — I *think*
there are enough EC shards, even disregarding the OSDs that crash on start.
nautilus 14.2.15
ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 54.75960 root default
-10 16.81067 host sumia
1 hdd 5.57719 osd.1 up 1.00000 1.00000
5 hdd 5.58469 osd.5 up 1.00000 1.00000
6 hdd 5.64879 osd.6 up 1.00000 1.00000
-7 16.73048 host sumib
0 hdd 5.57899 osd.0 up 1.00000 1.00000
2 hdd 5.56549 osd.2 up 1.00000 1.00000
3 hdd 5.58600 osd.3 up 1.00000 1.00000
-3 21.21844 host tower1
4 hdd 3.71680 osd.4 up 0 1.00000
7 hdd 1.84799 osd.7 up 1.00000 1.00000
8 hdd 3.71680 osd.8 up 1.00000 1.00000
9 hdd 1.84929 osd.9 up 1.00000 1.00000
10 hdd 2.72899 osd.10 up 1.00000 1.00000
11 hdd 3.71989 osd.11 down 0 1.00000
12 hdd 3.63869 osd.12 down 0 1.00000
cluster:
id: d0b4c175-02ba-4a64-8040-eb163002cba6
health: HEALTH_ERR
1 MDSs report slow requests
4/4239345 objects unfound (0.000%)
Too many repaired reads on 3 OSDs
Reduced data availability: 7 pgs inactive, 7 pgs down
Possible data damage: 4 pgs recovery_unfound
Degraded data redundancy: 95807/24738783 objects degraded
(0.387%), 4 pgs degraded, 3 pgs undersized
7 pgs not deep-scrubbed in time
7 pgs not scrubbed in time
services:
mon: 3 daemons, quorum sumib,tower1,sumia (age 4d)
mgr: sumib(active, since 7d), standbys: sumia, tower1
mds: cephfs:1 {0=sumib=up:active} 2 up:standby
osd: 13 osds: 11 up (since 3d), 10 in (since 4d); 3 remapped pgs
data:
pools: 5 pools, 256 pgs
objects: 4.24M objects, 15 TiB
usage: 24 TiB used, 24 TiB / 47 TiB avail
pgs: 2.734% pgs not active
95807/24738783 objects degraded (0.387%)
47910/24738783 objects misplaced (0.194%)
4/4239345 objects unfound (0.000%)
245 active+clean
7 down
3 active+recovery_unfound+undersized+degraded+remapped
1 active+recovery_unfound+degraded+repair
progress:
Rebalancing after osd.12 marked out
[============================..]
Rebalancing after osd.4 marked out
[=============================.]
An snipped from an example down pg:
"up": [
3,
2,
5,
1,
8,
9
],
"acting": [
3,
2,
5,
1,
8,
9
],
<snip>
],
"blocked": "peering is blocked due to down osds",
"down_osds_we_would_probe": [
11,
12
],
"peering_blocked_by": [
{
"osd": 11,
"current_lost_at": 0,
"comment": "starting or marking this osd lost may let
us proceed"
},
{
"osd": 12,
"current_lost_at": 0,
"comment": "starting or marking this osd lost may let
us proceed"
}
]
},
{
Oddly, these OSDs possibly did NOT experience hardware failure. However,
they won't start -- see pastebin for ceph-osd.11.log
https://pastebin.com/6U6sQJuJ
HEALTH_ERR 1 MDSs report slow requests; 4/4239345 objects unfound (0.000%);
Too many repaired reads on 3 OSDs; Reduced data availability
: 7 pgs inactive, 7 pgs down; Possible data damage: 4 pgs recovery_unfound;
Degraded data redundancy: 95807/24738783 objects degraded (0
.387%), 4 pgs degraded, 3 pgs undersized; 7 pgs not deep-scrubbed in time;
7 pgs not scrubbed in time
MDS_SLOW_REQUEST 1 MDSs report slow requests
mdssumib(mds.0): 42 slow requests are blocked > 30 secs
OBJECT_UNFOUND 4/4239345 objects unfound (0.000%)
pg 19.5 has 1 unfound objects
pg 15.2f has 1 unfound objects
pg 15.41 has 1 unfound objects
pg 15.58 has 1 unfound objects
OSD_TOO_MANY_REPAIRS Too many repaired reads on 3 OSDs
osd.9 had 9664 reads repaired
osd.7 had 9665 reads repaired
osd.4 had 12 reads repaired
PG_AVAILABILITY Reduced data availability: 7 pgs inactive, 7 pgs down
pg 15.10 is down, acting [3,2,5,1,8,9]
pg 15.1e is down, acting [5,1,9,8,2,3]
pg 15.40 is down, acting [7,10,1,5,3,2]
pg 15.4a is down, acting [0,3,5,6,9,10]
pg 15.6a is down, acting [3,2,6,1,10,8]
pg 15.71 is down, acting [3,2,1,6,8,10]
pg 15.76 is down, acting [2,0,6,5,10,9]
PG_DAMAGED Possible data damage: 4 pgs recovery_unfound
pg 15.2f is active+recovery_unfound+undersized+degraded+remapped,
acting [5,1,0,3,2147483647,7], 1 unfound
pg 15.41 is active+recovery_unfound+undersized+degraded+remapped,
acting [5,1,0,3,2147483647,2147483647], 1 unfound
pg 15.58 is active+recovery_unfound+undersized+degraded+remapped,
acting [10,2147483647,2,3,1,5], 1 unfound
pg 19.5 is active+recovery_unfound+degraded+repair, acting
[3,2,5,1,8,10], 1 unfound
PG_DEGRADED Degraded data redundancy: 95807/24738783 objects degraded
(0.387%), 4 pgs degraded, 3 pgs undersized
pg 15.2f is stuck undersized for 635305.932075, current state
active+recovery_unfound+undersized+degraded+remapped, last acting
[5,1,0,3,2147483647,7]
pg 15.41 is stuck undersized for 364298.836902, current state
active+recovery_unfound+undersized+degraded+remapped, last acting
[5,1,0,3,2147483647,2147483647]
pg 15.58 is stuck undersized for 384461.110229, current state
active+recovery_unfound+undersized+degraded+remapped, last acting
[10,2147483647,2,3,1,5]
pg 19.5 is active+recovery_unfound+degraded+repair, acting
[3,2,5,1,8,10], 1 unfound
PG_NOT_DEEP_SCRUBBED 7 pgs not deep-scrubbed in time
pg 15.76 not deep-scrubbed since 2020-10-21 14:30:03.935228
pg 15.71 not deep-scrubbed since 2020-10-21 12:20:46.235792
pg 15.6a not deep-scrubbed since 2020-10-21 07:52:33.914083
pg 15.10 not deep-scrubbed since 2020-10-22 03:24:40.465367
pg 15.1e not deep-scrubbed since 2020-10-22 10:37:36.169959
pg 15.40 not deep-scrubbed since 2020-10-23 05:33:35.208748
pg 15.4a not deep-scrubbed since 2020-10-22 05:14:06.981035
PG_NOT_SCRUBBED 7 pgs not scrubbed in time
pg 15.76 not scrubbed since 2020-10-24 08:12:40.090831
pg 15.71 not scrubbed since 2020-10-25 05:22:40.573572
pg 15.6a not scrubbed since 2020-10-24 15:03:09.189964
pg 15.10 not scrubbed since 2020-10-24 16:25:08.826981
pg 15.1e not scrubbed since 2020-10-24 16:05:03.080127
pg 15.40 not scrubbed since 2020-10-24 11:58:04.290488
pg 15.4a not scrubbed since 2020-10-24 11:32:44.573551
