Re: Cluster never reaching clean after osd out

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I have a Cluster of 3 hosts, running Debian wheezy and Backports Kernel 3.16.0-0.bpo.4-amd64.
For testing I did a 
~# ceph osd out 20
from a clean state.
Ceph starts rebalancing, watching ceph -w one sees changing pgs stuck unclean to get up and then go down to about 11.

Short after that the cluster keeps stuck forever in this state:
health HEALTH_WARN 68 pgs stuck unclean; recovery 450/169647 objects degraded (0.265%); 3691/169647 objects misplaced (2.176%)

According to the documentation at http://ceph.com/docs/master/rados/operations/add-or-rm-osds/ the Cluster should reach a clean state after an osd out.

What am I doing wrong?

Hi Yves and Cephers,

I have a cluster with 6 nodes and 36 OSD. I have the same pb :

    cluster 1d0503fb-36d0-4dbc-aabe-a2a0709163cd
     health HEALTH_WARN 76 pgs stuck unclean; recovery 1/624 objects degraded (0.160%); 7/624 objects misplaced (1.122%)
     monmap e6: 6 mons
     osdmap e616: 36 osds: 36 up, 35 in
      pgmap v16344: 2048 pgs, 1 pools, 689 MB data, 208 objects
            178 GB used, 127 TB / 127 TB avail
            1/624 objects degraded (0.160%); 7/624 objects misplaced (1.122%)
                  76 active+remapped
                1972 active+clean

After 'out' osd.15, ceph didn't return to health ok, and get misplaced object ... :-/
I noticed that this happen when i use a replicated 3 pool. When the pool use a replicated 2, ceph returned to health ok... Have you try with a replicated 2 pool ?

In the same way, I wonder why he does not return to the status ok


CEPH OSD TREE

# id    weight    type name    up/down    reweight
-1000    144    root default
-200    48        datacenter mo
-133    48            rack mom02
-4    24                host mom02h01
12    4                    osd.12    up    1    
13    4                    osd.13    up    1    
14    4                    osd.14    up    1    
16    4                    osd.16    up    1    
17    4                    osd.17    up    1    
15    4                    osd.15    up    0    
-5    24                host mom02h02
18    4                    osd.18    up    1    
19    4                    osd.19    up    1    
20    4                    osd.20    up    1    
21    4                    osd.21    up    1    
22    4                    osd.22    up    1    
23    4                    osd.23    up    1    
-202    48        datacenter me
-135    48            rack mem04
-6    24                host mem04h01
24    4                    osd.24    up    1    
25    4                    osd.25    up    1    
26    4                    osd.26    up    1    
27    4                    osd.27    up    1    
28    4                    osd.28    up    1    
29    4                    osd.29    up    1    
-7    24                host mem04h02
30    4                    osd.30    up    1    
31    4                    osd.31    up    1    
32    4                    osd.32    up    1    
33    4                    osd.33    up    1    
34    4                    osd.34    up    1    
35    4                    osd.35    up    1    
-201    48        datacenter li
-134    48            rack lis04
-2    24                host lis04h01
0    4                    osd.0    up    1    
2    4                    osd.2    up    1    
3    4                    osd.3    up    1    
4    4                    osd.4    up    1    
5    4                    osd.5    up    1    
1    4                    osd.1    up    1    
-3    24                host lis04h02
6    4                    osd.6    up    1    
7    4                    osd.7    up    1    
8    4                    osd.8    up    1    
9    4                    osd.9    up    1    
10    4                    osd.10    up    1    
11    4                    osd.11    up    1   


Crushmap

# begin crush map
tunable choose_local_tries 0
tunable choose_local_fallback_tries 0
tunable choose_total_tries 50
tunable chooseleaf_descend_once 1

# devices
device 0 osd.0
device 1 osd.1
device 2 osd.2
device 3 osd.3
device 4 osd.4
device 5 osd.5
device 6 osd.6
device 7 osd.7
device 8 osd.8
device 9 osd.9
device 10 osd.10
device 11 osd.11
device 12 osd.12
device 13 osd.13
device 14 osd.14
device 15 osd.15
device 16 osd.16
device 17 osd.17
device 18 osd.18
device 19 osd.19
device 20 osd.20
device 21 osd.21
device 22 osd.22
device 23 osd.23
device 24 osd.24
device 25 osd.25
device 26 osd.26
device 27 osd.27
device 28 osd.28
device 29 osd.29
device 30 osd.30
device 31 osd.31
device 32 osd.32
device 33 osd.33
device 34 osd.34
device 35 osd.35

# types
type 0 osd
type 1 host
type 2 chassis
type 3 rack
type 4 row
type 5 pdu
type 6 pod
type 7 room
type 8 datacenter
type 9 region
type 10 root

# buckets
host lis04h01 {
    id -2        # do not change unnecessarily
    # weight 24.000
    alg straw
    hash 0    # rjenkins1
    item osd.0 weight 4.000
    item osd.2 weight 4.000
    item osd.3 weight 4.000
    item osd.4 weight 4.000
    item osd.5 weight 4.000
    item osd.1 weight 4.000
}
host lis04h02 {
    id -3        # do not change unnecessarily
    # weight 24.000
    alg straw
    hash 0    # rjenkins1
    item osd.6 weight 4.000
    item osd.7 weight 4.000
    item osd.8 weight 4.000
    item osd.9 weight 4.000
    item osd.10 weight 4.000
    item osd.11 weight 4.000
}
host mom02h01 {
    id -4        # do not change unnecessarily
    # weight 24.000
    alg straw
    hash 0    # rjenkins1
    item osd.12 weight 4.000
    item osd.13 weight 4.000
    item osd.14 weight 4.000
    item osd.16 weight 4.000
    item osd.17 weight 4.000
    item osd.15 weight 4.000
}
host mom02h02 {
    id -5        # do not change unnecessarily
    # weight 24.000
    alg straw
    hash 0    # rjenkins1
    item osd.18 weight 4.000
    item osd.19 weight 4.000
    item osd.20 weight 4.000
    item osd.21 weight 4.000
    item osd.22 weight 4.000
    item osd.23 weight 4.000
}
host mem04h01 {
    id -6        # do not change unnecessarily
    # weight 24.000
    alg straw
    hash 0    # rjenkins1
    item osd.24 weight 4.000
    item osd.25 weight 4.000
    item osd.26 weight 4.000
    item osd.27 weight 4.000
    item osd.28 weight 4.000
    item osd.29 weight 4.000
}
host mem04h02 {
    id -7        # do not change unnecessarily
    # weight 24.000
    alg straw
    hash 0    # rjenkins1
    item osd.30 weight 4.000
    item osd.31 weight 4.000
    item osd.32 weight 4.000
    item osd.33 weight 4.000
    item osd.34 weight 4.000
    item osd.35 weight 4.000
}
rack mom02 {
    id -133        # do not change unnecessarily
    # weight 48.000
    alg straw
    hash 0    # rjenkins1
    item mom02h01 weight 24.000
    item mom02h02 weight 24.000
}
rack lis04 {
    id -134        # do not change unnecessarily
    # weight 48.000
    alg straw
    hash 0    # rjenkins1
    item lis04h01 weight 24.000
    item lis04h02 weight 24.000
}
rack mem04 {
    id -135        # do not change unnecessarily
    # weight 48.000
    alg straw
    hash 0    # rjenkins1
    item mem04h01 weight 24.000
    item mem04h02 weight 24.000
}
datacenter mo {
    id -200        # do not change unnecessarily
    # weight 48.000
    alg straw
    hash 0    # rjenkins1
    item mom02 weight 48.000
}
datacenter li {
    id -201        # do not change unnecessarily
    # weight 48.000
    alg straw
    hash 0    # rjenkins1
    item lis04 weight 48.000
}
datacenter me {
    id -202        # do not change unnecessarily
    # weight 48.000
    alg straw
    hash 0    # rjenkins1
    item mem04 weight 48.000
}
root default {
    id -1000        # do not change unnecessarily
    # weight 144.000
    alg straw
    hash 0    # rjenkins1
    item mo weight 48.000
    item me weight 48.000
    item li weight 48.000
}

# rules
rule replicated_ruleset {
    ruleset 0
    type replicated
    min_size 1
    max_size 10
    step take default
    step chooseleaf firstn 0 type datacenter
    step emit
}

# end crush map


Below some config and command outputs:


~# ceph osd tree
# id    weight  type name       up/down reweight
-1      76.02   root default
-2      25.34           host ve51
0       3.62                    osd.0   up      1
3       3.62                    osd.3   up      1
6       3.62                    osd.6   up      1
9       3.62                    osd.9   up      1
12      3.62                    osd.12  up      1
15      3.62                    osd.15  up      1
18      3.62                    osd.18  up      1
-3      25.34           host ve52
1       3.62                    osd.1   up      1
4       3.62                    osd.4   up      1
7       3.62                    osd.7   up      1
10      3.62                    osd.10  up      1
13      3.62                    osd.13  up      1
16      3.62                    osd.16  up      1
19      3.62                    osd.19  up      1
-4      25.34           host ve53
2       3.62                    osd.2   up      1
5       3.62                    osd.5   up      1
8       3.62                    osd.8   up      1
11      3.62                    osd.11  up      1
14      3.62                    osd.14  up      1
17      3.62                    osd.17  up      1
20      3.62                    osd.20  up      1
==========================
~# cat ceph.conf
[global]
fsid = 80ebba06-34f5-49fc-8178-d6cc1d1c1196
public_network = 192.168.10.0/24
cluster_network = 192.168.10.0/24
mon_initial_members = ve51, ve52, ve53
mon_host = 192.168.10.51,192.168.10.52,192.168.10.53
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
filestore_xattr_use_omap = true
mon_osd_down_out_subtree_limit = host
osd_pool_default_size=3
osd_pool_default_min_size=2
[osd]
osd_journal_size = 20000
osd_mount_options_xfs = noatime,nodiratime,logbsize=256k,logbufs=8,inode64
==========================
~# ceph -s
    cluster 80ebba06-34f5-49fc-8178-d6cc1d1c1196
     health HEALTH_OK
     monmap e1: 3 mons at {ve51=192.168.10.51:6789/0,ve52=192.168.10.52:6789/0,ve53=192.168.10.53:6789/0}, election epoch 28, quorum 0,1,2 ve51,ve52,ve53
     osdmap e1353: 21 osds: 21 up, 21 in
      pgmap v16484: 2048 pgs, 2 pools, 219 GB data, 56549 objects
            658 GB used, 77139 GB / 77797 GB avail
                2048 active+clean
==========================                
~# cat crushmap
# begin crush map
tunable choose_local_tries 0
tunable choose_local_fallback_tries 0
tunable choose_total_tries 50
tunable chooseleaf_descend_once 1
# devices
device 0 osd.0
device 1 osd.1
device 2 osd.2
device 3 osd.3
device 4 osd.4
device 5 osd.5
device 6 osd.6
device 7 osd.7
device 8 osd.8
device 9 osd.9
device 10 osd.10
device 11 osd.11
device 12 osd.12
device 13 osd.13
device 14 osd.14
device 15 osd.15
device 16 osd.16
device 17 osd.17
device 18 osd.18
device 19 osd.19
device 20 osd.20
# types
type 0 osd
type 1 host
type 2 chassis
type 3 rack
type 4 row
type 5 pdu
type 6 pod
type 7 room
type 8 datacenter
type 9 region
type 10 root
# buckets
host ve51 {
        id -2           # do not change unnecessarily
        # weight 25.340
        alg straw
        hash 0  # rjenkins1
        item osd.0 weight 3.620
        item osd.3 weight 3.620
        item osd.6 weight 3.620
        item osd.9 weight 3.620
        item osd.12 weight 3.620
        item osd.15 weight 3.620
        item osd.18 weight 3.620
}
host ve52 {
        id -3           # do not change unnecessarily
        # weight 25.340
        alg straw
        hash 0  # rjenkins1
        item osd.1 weight 3.620
        item osd.4 weight 3.620
        item osd.7 weight 3.620
        item osd.10 weight 3.620
        item osd.13 weight 3.620
        item osd.16 weight 3.620
        item osd.19 weight 3.620
}
host ve53 {
        id -4           # do not change unnecessarily
        # weight 25.340
        alg straw
        hash 0  # rjenkins1
        item osd.2 weight 3.620
        item osd.5 weight 3.620
        item osd.8 weight 3.620
        item osd.11 weight 3.620
        item osd.14 weight 3.620
        item osd.17 weight 3.620
        item osd.20 weight 3.620
}
root default {
        id -1           # do not change unnecessarily
        # weight 76.020
        alg straw
        hash 0  # rjenkins1
        item ve51 weight 25.340
        item ve52 weight 25.340
        item ve53 weight 25.340
}
# rules
rule replicated_ruleset {
        ruleset 0
        type replicated
        min_size 1
        max_size 10
        step take default
        step chooseleaf firstn 0 type host
        step emit
}
# end crush map
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