Re: Ceph does not recover from OSD restart

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You said you had to move some OSDs out and back in for Ceph to go back to normal (The OSDs you added). Which OSDs were added?

-----Original Message-----
From: Frank Schilder <frans@xxxxxx> 
Sent: Monday, August 3, 2020 9:55 AM
To: Eric Smith <Eric.Smith@xxxxxxxxxx>; ceph-users <ceph-users@xxxxxxx>
Subject: Re: Ceph does not recover from OSD restart

Hi Eric,

thanks for your fast response. Below the output, shortened a bit as indicated. Disks have been added to pool 11 'sr-rbd-data-one-hdd' only, this is the only pool with remapped PGs and is also the only pool experiencing the "loss of track" to objects. Every other pool recovers from restart by itself.

Best regards,
Frank


# ceph osd pool stats
pool sr-rbd-meta-one id 1
  client io 5.3 KiB/s rd, 3.2 KiB/s wr, 4 op/s rd, 1 op/s wr

pool sr-rbd-data-one id 2
  client io 24 MiB/s rd, 32 MiB/s wr, 380 op/s rd, 594 op/s wr

pool sr-rbd-one-stretch id 3
  nothing is going on

pool con-rbd-meta-hpc-one id 7
  nothing is going on

pool con-rbd-data-hpc-one id 8
  client io 0 B/s rd, 5.6 KiB/s wr, 0 op/s rd, 0 op/s wr

pool sr-rbd-data-one-hdd id 11
  53241814/346903376 objects misplaced (15.348%)
  client io 73 MiB/s rd, 3.4 MiB/s wr, 236 op/s rd, 69 op/s wr

pool con-fs2-meta1 id 12
  client io 106 KiB/s rd, 112 KiB/s wr, 3 op/s rd, 11 op/s wr

pool con-fs2-meta2 id 13
  client io 0 B/s wr, 0 op/s rd, 0 op/s wr

pool con-fs2-data id 14
  client io 5.5 MiB/s rd, 201 KiB/s wr, 34 op/s rd, 8 op/s wr

pool con-fs2-data-ec-ssd id 17
  nothing is going on

pool ms-rbd-one id 18
  client io 5.6 MiB/s wr, 0 op/s rd, 179 op/s wr


# ceph osd pool ls detail
pool 1 'sr-rbd-meta-one' replicated size 3 min_size 2 crush_rule 11 object_hash rjenkins pg_num 80 pgp_num 80 last_change 122597 flags hashpspool,nodelete,selfmanaged_snaps max_bytes 536870912000 stripe_width 0 application rbd
	removed_snaps [1~45]
pool 2 'sr-rbd-data-one' erasure size 8 min_size 6 crush_rule 5 object_hash rjenkins pg_num 560 pgp_num 560 last_change 186437 lfor 0/126858 flags hashpspool,ec_overwrites,nodelete,selfmanaged_snaps max_bytes 43980465111040 stripe_width 24576 fast_read 1 compression_mode aggressive application rbd
	removed_snaps [1~3,5~2, ... huge list ... ,11f9d~1,11fa0~2] pool 3 'sr-rbd-one-stretch' replicated size 3 min_size 2 crush_rule 12 object_hash rjenkins pg_num 160 pgp_num 160 last_change 143202 lfor 0/79983 flags hashpspool,nodelete,selfmanaged_snaps max_bytes 1099511627776 stripe_width 0 compression_mode aggressive application rbd
	removed_snaps [1~7,b~2,11~2,14~2,17~9e,b8~1e] pool 7 'con-rbd-meta-hpc-one' replicated size 3 min_size 2 crush_rule 3 object_hash rjenkins pg_num 50 pgp_num 50 last_change 96357 lfor 0/90462 flags hashpspool,nodelete,selfmanaged_snaps max_bytes 10737418240 stripe_width 0 application rbd
	removed_snaps [1~3]
pool 8 'con-rbd-data-hpc-one' erasure size 10 min_size 9 crush_rule 7 object_hash rjenkins pg_num 150 pgp_num 150 last_change 96358 lfor 0/90996 flags hashpspool,ec_overwrites,nodelete,selfmanaged_snaps max_bytes 5497558138880 stripe_width 32768 fast_read 1 compression_mode aggressive application rbd
	removed_snaps [1~7,9~2]
pool 11 'sr-rbd-data-one-hdd' erasure size 8 min_size 6 crush_rule 9 object_hash rjenkins pg_num 560 pgp_num 560 last_change 186331 lfor 0/127768 flags hashpspool,ec_overwrites,nodelete,selfmanaged_snaps max_bytes 219902325555200 stripe_width 24576 fast_read 1 compression_mode aggressive application rbd
	removed_snaps [1~59f,5a2~fe, ... less huge list ... ,2559~1,255b~1]
	removed_snaps_queue [1a64~5,1a6a~1,1a6c~1, ... long list ... ,220a~1,220c~1] pool 12 'con-fs2-meta1' replicated size 3 min_size 2 crush_rule 3 object_hash rjenkins pg_num 50 pgp_num 50 last_change 57096 flags hashpspool,nodelete max_bytes 268435456000 stripe_width 0 application cephfs pool 13 'con-fs2-meta2' replicated size 3 min_size 2 crush_rule 3 object_hash rjenkins pg_num 50 pgp_num 50 last_change 96359 flags hashpspool,nodelete max_bytes 107374182400 stripe_width 0 application cephfs pool 14 'con-fs2-data' erasure size 10 min_size 9 crush_rule 8 object_hash rjenkins pg_num 1350 pgp_num 1350 last_change 96360 lfor 0/91144 flags hashpspool,ec_overwrites,nodelete max_bytes 879609302220800 stripe_width 32768 fast_read 1 compression_mode aggressive application cephfs pool 17 'con-fs2-data-ec-ssd' erasure size 10 min_size 9 crush_rule 10 object_hash rjenkins pg_num 55 pgp_num 55 last_change 96361 lfor 0/90473 flags hashpspool,ec_overwrites,nodelete max_bytes 1099511627776 stripe_width 32768 fast_read 1 compression_mode aggressive application cephfs pool 18 'ms-rbd-one' replicated size 3 min_size 2 crush_rule 12 object_hash rjenkins pg_num 150 pgp_num 150 last_change 143206 flags hashpspool,nodelete,selfmanaged_snaps max_bytes 1099511627776 stripe_width 0 compression_mode aggressive application rbd
	removed_snaps [1~3]


# ceph osd tree
ID   CLASS    WEIGHT     TYPE NAME                          STATUS REWEIGHT PRI-AFF 
 -40          2384.09058 root DTU                                                   
 -42                   0     region Lyngby                                          
 -41          2384.09058     region Risoe                                           

2 sub-trees on level datacenter removed for brevity

 -49           586.49347         datacenter ServerRoom                              
 -55           586.49347             room SR-113                                    
 -65            64.33617                 host ceph-04                               
  84      hdd    8.90999                     osd.84             up  1.00000 1.00000 
 145      hdd    8.90999                     osd.145            up  1.00000 1.00000 
 156      hdd    8.90999                     osd.156            up  1.00000 1.00000 
 168      hdd    8.90999                     osd.168            up  1.00000 1.00000 
 181      hdd    8.90999                     osd.181            up  0.95000 1.00000 
 288      hdd   10.69229                     osd.288            up  1.00000 1.00000 
 243 rbd_data    1.74599                     osd.243            up  1.00000 1.00000 
 254 rbd_data    1.74599                     osd.254            up  1.00000 1.00000 
 256 rbd_data    1.74599                     osd.256            up  1.00000 1.00000 
 286 rbd_data    1.74599                     osd.286            up  1.00000 1.00000 
 287 rbd_data    1.74599                     osd.287            up  1.00000 1.00000 
  48 rbd_meta    0.36400                     osd.48             up  1.00000 1.00000 
 -67            64.33617                 host ceph-05                               
  74      hdd    8.90999                     osd.74             up  1.00000 1.00000 
 144      hdd    8.90999                     osd.144            up  1.00000 1.00000 
 157      hdd    8.90999                     osd.157            up  0.84999 1.00000 
 169      hdd    8.90999                     osd.169            up  0.95000 1.00000 
 180      hdd    8.90999                     osd.180            up  0.89999 1.00000 
 289      hdd   10.69229                     osd.289            up  1.00000 1.00000 
 240 rbd_data    1.74599                     osd.240            up  1.00000 1.00000 
 251 rbd_data    1.74599                     osd.251            up  1.00000 1.00000 
 255 rbd_data    1.74599                     osd.255            up  1.00000 1.00000 
 284 rbd_data    1.74599                     osd.284            up  1.00000 1.00000 
 285 rbd_data    1.74599                     osd.285            up  1.00000 1.00000 
  49 rbd_meta    0.36400                     osd.49             up  1.00000 1.00000 
 -69            64.70016                 host ceph-06                               
  60      hdd    8.90999                     osd.60             up  1.00000 1.00000 
 146      hdd    8.90999                     osd.146            up  1.00000 1.00000 
 158      hdd    8.90999                     osd.158            up  0.95000 1.00000 
 170      hdd    8.90999                     osd.170            up  0.89999 1.00000 
 182      hdd    8.90999                     osd.182            up  1.00000 1.00000 
 290      hdd   10.69229                     osd.290            up  1.00000 1.00000 
 244 rbd_data    1.74599                     osd.244            up  1.00000 1.00000 
 253 rbd_data    1.74599                     osd.253            up  1.00000 1.00000 
 257 rbd_data    1.74599                     osd.257            up  1.00000 1.00000 
 282 rbd_data    1.74599                     osd.282            up  1.00000 1.00000 
 283 rbd_data    1.74599                     osd.283            up  1.00000 1.00000 
  40 rbd_meta    0.36400                     osd.40             up  1.00000 1.00000 
  50 rbd_meta    0.36400                     osd.50             up  1.00000 1.00000 
 -71            64.33617                 host ceph-07                               
  63      hdd    8.90999                     osd.63             up  1.00000 1.00000 
 148      hdd    8.90999                     osd.148            up  0.95000 1.00000 
 159      hdd    8.90999                     osd.159            up  1.00000 1.00000 
 172      hdd    8.90999                     osd.172            up  0.95000 1.00000 
 183      hdd    8.90999                     osd.183            up  0.84999 1.00000 
 292      hdd   10.69229                     osd.292            up  1.00000 1.00000 
 242 rbd_data    1.74599                     osd.242            up  1.00000 1.00000 
 252 rbd_data    1.74599                     osd.252            up  1.00000 1.00000 
 258 rbd_data    1.74599                     osd.258            up  1.00000 1.00000 
 279 rbd_data    1.74599                     osd.279            up  1.00000 1.00000 
 280 rbd_data    1.74599                     osd.280            up  1.00000 1.00000 
  52 rbd_meta    0.36400                     osd.52             up  1.00000 1.00000 
 -81            66.70416                 host ceph-18                               
 229      hdd    8.90999                     osd.229            up  1.00000 1.00000 
 232      hdd    8.90999                     osd.232            up  1.00000 1.00000 
 235      hdd    8.90999                     osd.235            up  1.00000 1.00000 
 238      hdd    8.90999                     osd.238            up  0.95000 1.00000 
 259      hdd   10.91399                     osd.259            up  1.00000 1.00000 
 293      hdd   10.69229                     osd.293            up  1.00000 1.00000 
 241 rbd_data    1.74599                     osd.241            up  1.00000 1.00000 
 248 rbd_data    1.74599                     osd.248            up  1.00000 1.00000 
 266 rbd_data    1.74599                     osd.266            up  1.00000 1.00000 
 267 rbd_data    1.74599                     osd.267            up  1.00000 1.00000 
 277 rbd_data    1.74599                     osd.277            up  1.00000 1.00000 
  31 rbd_meta    0.36400                     osd.31             up  1.00000 1.00000 
  41 rbd_meta    0.36400                     osd.41             up  1.00000 1.00000 
 -94            66.34016                 host ceph-19                               
 231      hdd    8.90999                     osd.231            up  1.00000 1.00000 
 233      hdd    8.90999                     osd.233            up  0.95000 1.00000 
 236      hdd    8.90999                     osd.236            up  1.00000 1.00000 
 239      hdd    8.90999                     osd.239            up  1.00000 1.00000 
 263      hdd   10.91399                     osd.263            up  1.00000 1.00000 
 295      hdd   10.69229                     osd.295            up  1.00000 1.00000 
 261 rbd_data    1.74599                     osd.261            up  1.00000 1.00000 
 262 rbd_data    1.74599                     osd.262            up  1.00000 1.00000 
 268 rbd_data    1.74599                     osd.268            up  1.00000 1.00000 
 269 rbd_data    1.74599                     osd.269            up  1.00000 1.00000 
 275 rbd_data    1.74599                     osd.275            up  1.00000 1.00000 
  43 rbd_meta    0.36400                     osd.43             up  1.00000 1.00000 
  -4            66.70416                 host ceph-20                               
 228      hdd    8.90999                     osd.228            up  1.00000 1.00000 
 230      hdd    8.90999                     osd.230            up  1.00000 1.00000 
 234      hdd    8.90999                     osd.234            up  0.95000 1.00000 
 237      hdd    8.90999                     osd.237            up  1.00000 1.00000 
 260      hdd   10.91399                     osd.260            up  1.00000 1.00000 
 296      hdd   10.69229                     osd.296            up  1.00000 1.00000 
 245 rbd_data    1.74599                     osd.245            up  1.00000 1.00000 
 270 rbd_data    1.74599                     osd.270            up  1.00000 1.00000 
 271 rbd_data    1.74599                     osd.271            up  1.00000 1.00000 
 272 rbd_data    1.74599                     osd.272            up  1.00000 1.00000 
 273 rbd_data    1.74599                     osd.273            up  1.00000 1.00000 
  28 rbd_meta    0.36400                     osd.28             up  1.00000 1.00000 
  44 rbd_meta    0.36400                     osd.44             up  1.00000 1.00000 
 -64            64.70016                 host ceph-21                               
   0      hdd    8.90999                     osd.0              up  1.00000 1.00000 
   2      hdd    8.90999                     osd.2              up  0.95000 1.00000 
  72      hdd    8.90999                     osd.72             up  1.00000 1.00000 
  76      hdd    8.90999                     osd.76             up  1.00000 1.00000 
  86      hdd    8.90999                     osd.86             up  1.00000 1.00000 
 291      hdd   10.69229                     osd.291            up  1.00000 1.00000 
 246 rbd_data    1.74599                     osd.246            up  1.00000 1.00000 
 247 rbd_data    1.74599                     osd.247            up  1.00000 1.00000 
 264 rbd_data    1.74599                     osd.264            up  1.00000 1.00000 
 274 rbd_data    1.74599                     osd.274            up  1.00000 1.00000 
 278 rbd_data    1.74599                     osd.278            up  1.00000 1.00000 
  39 rbd_meta    0.36400                     osd.39             up  1.00000 1.00000 
  53 rbd_meta    0.36400                     osd.53             up  1.00000 1.00000 
 -66            64.33617                 host ceph-22                               
   1      hdd    8.90999                     osd.1              up  1.00000 1.00000 
   3      hdd    8.90999                     osd.3              up  1.00000 1.00000 
  73      hdd    8.90999                     osd.73             up  1.00000 1.00000 
  85      hdd    8.90999                     osd.85             up  0.95000 1.00000 
  87      hdd    8.90999                     osd.87             up  1.00000 1.00000 
 294      hdd   10.69229                     osd.294            up  1.00000 1.00000 
 249 rbd_data    1.74599                     osd.249            up  1.00000 1.00000 
 250 rbd_data    1.74599                     osd.250            up  1.00000 1.00000 
 265 rbd_data    1.74599                     osd.265            up  1.00000 1.00000 
 276 rbd_data    1.74599                     osd.276            up  1.00000 1.00000 
 281 rbd_data    1.74599                     osd.281            up  1.00000 1.00000 
  51 rbd_meta    0.36400                     osd.51             up  1.00000 1.00000 


# ceph osd crush rule dump # crush rules outside tree under "datacenter ServerRoom" removed for brevity [
    {
        "rule_id": 0,
        "rule_name": "replicated_rule",
        "ruleset": 0,
        "type": 1,
        "min_size": 1,
        "max_size": 10,
        "steps": [
            {
                "op": "take",
                "item": -1,
                "item_name": "default"
            },
            {
                "op": "chooseleaf_firstn",
                "num": 0,
                "type": "host"
            },
            {
                "op": "emit"
            }
        ]
    },
    {
        "rule_id": 5,
        "rule_name": "sr-rbd-data-one",
        "ruleset": 5,
        "type": 3,
        "min_size": 3,
        "max_size": 8,
        "steps": [
            {
                "op": "set_chooseleaf_tries",
                "num": 50
            },
            {
                "op": "set_choose_tries",
                "num": 1000
            },
            {
                "op": "take",
                "item": -185,
                "item_name": "ServerRoom~rbd_data"
            },
            {
                "op": "chooseleaf_indep",
                "num": 0,
                "type": "host"
            },
            {
                "op": "emit"
            }
        ]
    },
    {
        "rule_id": 9,
        "rule_name": "sr-rbd-data-one-hdd",
        "ruleset": 9,
        "type": 3,
        "min_size": 3,
        "max_size": 8,
        "steps": [
            {
                "op": "set_chooseleaf_tries",
                "num": 5
            },
            {
                "op": "set_choose_tries",
                "num": 100
            },
            {
                "op": "take",
                "item": -53,
                "item_name": "ServerRoom~hdd"
            },
            {
                "op": "chooseleaf_indep",
                "num": 0,
                "type": "host"
            },
            {
                "op": "emit"
            }
        ]
    }
]


=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14

________________________________________
From: Eric Smith <Eric.Smith@xxxxxxxxxx>
Sent: 03 August 2020 15:40
To: Frank Schilder; ceph-users
Subject: RE: Ceph does not recover from OSD restart

Can you post the output of these commands:

ceph osd pool ls detail
ceph osd tree
ceph osd crush rule dump


-----Original Message-----
From: Frank Schilder <frans@xxxxxx>
Sent: Monday, August 3, 2020 9:19 AM
To: ceph-users <ceph-users@xxxxxxx>
Subject:  Re: Ceph does not recover from OSD restart

After moving the newly added OSDs out of the crush tree and back in again, I get to exactly what I want to see:

  cluster:
    id:     e4ece518-f2cb-4708-b00f-b6bf511e91d9
    health: HEALTH_WARN
            norebalance,norecover flag(s) set
            53030026/1492404361 objects misplaced (3.553%)
            1 pools nearfull

  services:
    mon: 3 daemons, quorum ceph-01,ceph-02,ceph-03
    mgr: ceph-01(active), standbys: ceph-03, ceph-02
    mds: con-fs2-1/1/1 up  {0=ceph-08=up:active}, 1 up:standby-replay
    osd: 297 osds: 272 up, 272 in; 307 remapped pgs
         flags norebalance,norecover

  data:
    pools:   11 pools, 3215 pgs
    objects: 177.3 M objects, 489 TiB
    usage:   696 TiB used, 1.2 PiB / 1.9 PiB avail
    pgs:     53030026/1492404361 objects misplaced (3.553%)
             2902 active+clean
             299  active+remapped+backfill_wait
             8    active+remapped+backfilling
             5    active+clean+scrubbing+deep
             1    active+clean+snaptrim

  io:
    client:   69 MiB/s rd, 117 MiB/s wr, 399 op/s rd, 856 op/s wr

Why does a cluster with remapped PGs not survive OSD restarts without loosing track of objects?
Why is it not finding the objects by itself?

A power outage of 3 hosts will halt everything for no reason until manual intervention. How can I avoid this problem?

Best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14

________________________________________
From: Frank Schilder <frans@xxxxxx>
Sent: 03 August 2020 15:03:05
To: ceph-users
Subject:  Ceph does not recover from OSD restart

Dear cephers,

I have a serious issue with degraded objects after an OSD restart. The cluster was in a state of re-balancing after adding disks to each host. Before restart I had "X/Y objects misplaced". Apart from that, health was OK. I now restarted all OSDs of one host and the cluster does not recover from that:

  cluster:
    id:     xxx
    health: HEALTH_ERR
            45813194/1492348700 objects misplaced (3.070%)
            Degraded data redundancy: 6798138/1492348700 objects degraded (0.456%), 85 pgs degraded, 86 pgs undersized
            Degraded data redundancy (low space): 17 pgs backfill_toofull
            1 pools nearfull

  services:
    mon: 3 daemons, quorum ceph-01,ceph-02,ceph-03
    mgr: ceph-01(active), standbys: ceph-03, ceph-02
    mds: con-fs2-1/1/1 up  {0=ceph-08=up:active}, 1 up:standby-replay
    osd: 297 osds: 272 up, 272 in; 307 remapped pgs

  data:
    pools:   11 pools, 3215 pgs
    objects: 177.3 M objects, 489 TiB
    usage:   696 TiB used, 1.2 PiB / 1.9 PiB avail
    pgs:     6798138/1492348700 objects degraded (0.456%)
             45813194/1492348700 objects misplaced (3.070%)
             2903 active+clean
             209  active+remapped+backfill_wait
             73   active+undersized+degraded+remapped+backfill_wait
             9    active+remapped+backfill_wait+backfill_toofull
             8    active+undersized+degraded+remapped+backfill_wait+backfill_toofull
             4    active+undersized+degraded+remapped+backfilling
             3    active+remapped+backfilling
             3    active+clean+scrubbing+deep
             1    active+clean+scrubbing
             1    active+undersized+remapped+backfilling
             1    active+clean+snaptrim

  io:
    client:   47 MiB/s rd, 61 MiB/s wr, 732 op/s rd, 792 op/s wr
    recovery: 195 MiB/s, 48 objects/s

After restarting there should only be a small number of degraded objects, the ones that received writes during OSD restart. What I see, however, is that the cluster seems to have lost track of a huge amount of objects, the 0.456% degraded are 1-2 days worth of I/O. I did reboots before and saw only a few thousand objects degraded at most. The output of ceph health detail shows a lot of lines like these:

[root@gnosis ~]# ceph health detail
HEALTH_ERR 45804316/1492356704 objects misplaced (3.069%); Degraded data redundancy: 6792562/1492356704 objects degraded (0.455%), 85 pgs degraded, 86 pgs undersized; Degraded data redundancy (low space): 17 pgs backfill_toofull; 1 pools nearfull OBJECT_MISPLACED 45804316/1492356704 objects misplaced (3.069%) PG_DEGRADED Degraded data redundancy: 6792562/1492356704 objects degraded (0.455%), 85 pgs degraded, 86 pgs undersized
    pg 11.9 is stuck undersized for 815.188981, current state active+undersized+degraded+remapped+backfill_wait, last acting [60,148,2147483647,263,76,230,87,169]
8...9
    pg 11.48 is active+undersized+degraded+remapped+backfill_wait, acting [159,60,180,263,237,3,2147483647,72]
    pg 11.4a is stuck undersized for 851.162862, current state active+undersized+degraded+remapped+backfill_wait, last acting [182,233,87,228,2,180,63,2147483647]
[...]
    pg 11.22e is stuck undersized for 851.162402, current state active+undersized+degraded+remapped+backfill_wait+backfill_toofull, last acting [234,183,239,2147483647,170,229,1,86]
PG_DEGRADED_FULL Degraded data redundancy (low space): 17 pgs backfill_toofull
    pg 11.24 is active+undersized+degraded+remapped+backfill_wait+backfill_toofull, acting [230,259,2147483647,1,144,159,233,146]
[...]
    pg 11.1d9 is active+remapped+backfill_wait+backfill_toofull, acting [84,259,183,170,85,234,233,2]
    pg 11.225 is active+undersized+degraded+remapped+backfill_wait+backfill_toofull, acting [236,183,1,2147483647,2147483647,169,229,230]
    pg 11.22e is active+undersized+degraded+remapped+backfill_wait+backfill_toofull, acting [234,183,239,2147483647,170,229,1,86]
POOL_NEAR_FULL 1 pools nearfull
    pool 'sr-rbd-data-one-hdd' has 164 TiB (max 200 TiB)

It looks like a lot of PGs are not receiving theire complete crush map placement, as if the peering is incomplete. This is a serious issue, it looks like the cluster will see a total storage loss if just 2 more hosts reboot - without actually having lost any storage. The pool in question is a 6+2 EC pool.

What is going on here? Why are the PG-maps not restored to their values from before the OSD reboot? The degraded PGs should receive the missing OSD IDs, everything is up exactly as it was before the reboot.

Thanks for your help and best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
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