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I think it's because af-staging-ceph02 data can only be moved to af-staging-ceph01/3 which already have the data. There is no acceptable place to create the third replicate of data.
Etienne From: ceph-users <ceph-users-bounces@xxxxxxxxxxxxxx> on behalf of Oleg Obleukhov <leoleovich@xxxxxxxxx>
Sent: Friday, June 2, 2017 16:15 To: ceph-users@xxxxxxxxxxxxxx Subject: Recovery stuck in active+undersized+degraded Hello,
I am playing around with ceph (ceph version 10.2.7 (50e863e0f4bc8f4b9e31156de690d765af245185)) on Debian Jessie and I build a test setup:
$ ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 0.01497 root default
-2 0.00499 host af-staging-ceph01
0 0.00499 osd.0 up 1.00000 1.00000
-3 0.00499 host af-staging-ceph02
1 0.00499 osd.1 up 1.00000 1.00000
-4 0.00499 host af-staging-ceph03
2 0.00499 osd.2 up 1.00000 1.00000
So I have 3 osd on 3 servers.
I also created 2 pools:
ceph osd dump | grep 'replicated size'
pool 1 'cephfs_data' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 32 pgp_num 32 last_change 33 flags hashpspool crash_replay_interval 45 stripe_width 0
pool 2 'cephfs_metadata' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 32 pgp_num 32 last_change 31 flags hashpspool stripe_width 0
Now I am testing failover and kill one of servers:
ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 0.01497 root default
-2 0.00499 host af-staging-ceph01
0 0.00499 osd.0 up 1.00000 1.00000
-3 0.00499 host af-staging-ceph02
1 0.00499 osd.1 down 1.00000 1.00000
-4 0.00499 host af-staging-ceph03
2 0.00499 osd.2 up 1.00000 1.00000
And now it stuck in the recovery state:
ceph -s
cluster 6b5ff07a-7232-4840-b486-6b7906248de7
health HEALTH_WARN
64 pgs degraded
18 pgs stuck unclean
64 pgs undersized
recovery 21/63 objects degraded (33.333%)
1/3 in osds are down
1 mons down, quorum 0,2 af-staging-ceph01,af-staging-ceph03
monmap e1: 3 mons at {af-staging-ceph01=10.36.0.121:6789/0,af-staging-ceph02=10.36.0.122:6789/0,af-staging-ceph03=10.36.0.123:6789/0}
election epoch 38, quorum 0,2 af-staging-ceph01,af-staging-ceph03
fsmap e29: 1/1/1 up {0=af-staging-ceph03.crm.ig.local=up:active}, 2 up:standby
osdmap e78: 3 osds: 2 up, 3 in; 64 remapped pgs
flags sortbitwise,require_jewel_osds
pgmap v334: 64 pgs, 2 pools, 47129 bytes data, 21 objects
122 MB used, 15204 MB / 15326 MB avail
21/63 objects degraded (33.333%)
64 active+undersized+degraded
And if I kill one more node I lose access to mounted file system on client.
Normally I would expect replica-factor to be respected and ceph should create the missing copies of degraded pg.
I was trying to rebuild the crush map and it looks like this, but this did not help:
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step chooseleaf firstn 0 type osd
step emit
}
# end crush map
Would very appreciate help,
Thank you very much in advance,
Oleg.
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