Re: Ceph 14.2 - some PGs stuck peering.

[Eugen Block <eblock@xxxxxx>]

Hi,

it's not really clear what happened, I would investigate the root  
cause first. Did some of the OSDs fail, if yes, why?
To increase the recovery speed you can change these values live:

osd_max_backfills
osd_recovery_max_active

Choose carefully and only increase slowly as it can easily impact client I/O.

In the subject you write that they're stuck peering but you also write:

> PGs seem to be slowly migrating from peering to activating but it's  
> going very slowly - approx 10PGs during last hour.

So they're not stuck, correct?

Regards,
Eugen


Zitat von m.sliwinski@xxxxx:

> Hi
>
> We have a weird issue iwth our ceph cluster - almost all PGs  
> assigned to one specific pool became stuck, locking out all  
> operations without reporting any errors.
> Story:
> We have 3 different pools, hdd-backed, ssd-backed and nvme-backed.
> Pool ssh worked fine for few months.
> Today one of the hosts assigned to nvme pool restarted triggering  
> recovery in that pool. It wnet fast and cluster went to OK state.
> During these events or shortly after them ssd pool became  
> unresponsive. It was impossible to either read or write from/to it.
> We decided to slowly restart fist OSDs assigned to it, thenm as it  
> didn't help - all the mons, wihout breaking quorum of course.
> At this moment both nvme and hdd polls are working fine, ssd one is  
> stuck in recovery.
> All OSDs in that ssd pool use large amount of CPU and are exchanging  
> approx 1Mpps per OSD server between each other.
>
> PGs seem to be slowly migrating from peering to activating but it's  
> going very slowly - approx 10PGs during last hour.
>
> We were using 14.2.2 OSDs when issues happened, upgrade to 14.2.13  
> didn't help. We increased heartbeat grace, but it didn't change  
> anything.
> It doesn't seem that there's a network problem as OSDs don't report  
> problems with connecting to MONs or each other. Other OSDs - nvme,  
> connected to that same set of switches work without issues.
>
> Can you help? Point me to what should i check or do? I looked  
> on-line and on the group for causes of peering issues and checked  
> most of them, nothing helped.
> I can't use 'ceph pg 28.1cc query' as it hangs, even for PGs that  
> are marked as active+clean in the results of 'ceph pg dump'
>
> I checked status of the one of stuck PGs via ceph-objectstore-tool  
> --data-path [...] --op info --pgid 28.29d for all three copies and  
> got:
>
> {
> "pgid": "28.29d",
> "last_update": "68160'205094",
> "last_complete": "68160'205094",
> "log_tail": "68062'202000",
> "last_user_version": 205094,
> "last_backfill": "MAX",
> "last_backfill_bitwise": 0,
> "purged_snaps": [
> {
> "start": "1",
> "length": "3"
> }
> ],
> "history": {
> "epoch_created": 67698,
> "epoch_pool_created": 67698,
> "last_epoch_started": 68871,
> "last_interval_started": 68851,
> "last_epoch_clean": 67746,
> "last_interval_clean": 67745,
> "last_epoch_split": 0,
> "last_epoch_marked_full": 0,
> "same_up_since": 69447,
> "same_interval_since": 69447,
> "same_primary_since": 69411,
> "last_scrub": "68062'199623",
> "last_scrub_stamp": "2020-11-03 03:32:46.895988",
> "last_deep_scrub": "68062'177321",
> "last_deep_scrub_stamp": "2020-11-02 01:07:15.963916",
> "last_clean_scrub_stamp": "2020-11-03 03:32:46.895988"
> },
> "stats": {
> "version": "68160'205094",
> "reported_seq": "378496",
> "reported_epoch": "69447",
> "state": "peering",
> "last_fresh": "2020-11-03 20:55:39.247348",
> "last_change": "2020-11-03 20:55:39.247348",
> "last_active": "2020-11-03 15:26:24.270088",
> "last_peered": "2020-11-03 19:04:43.152655",
> "last_clean": "2020-11-03 14:45:02.988293",
> "last_became_active": "2020-09-01 13:52:40.091759",
> "last_became_peered": "2020-11-03 19:04:42.939991",
> "last_unstale": "2020-11-03 20:55:39.247348",
> "last_undegraded": "2020-11-03 20:55:39.247348",
> "last_fullsized": "2020-11-03 20:55:39.247348",
> "mapping_epoch": 69447,
> "log_start": "68062'202000",
> "ondisk_log_start": "68062'202000",
> "created": 67698,
> "last_epoch_clean": 67746,
> "parent": "0.0",
> "parent_split_bits": 0,
> "last_scrub": "68062'199623",
> "last_scrub_stamp": "2020-11-03 03:32:46.895988",
> "last_deep_scrub": "68062'177321",
> "last_deep_scrub_stamp": "2020-11-02 01:07:15.963916",
> "last_clean_scrub_stamp": "2020-11-03 03:32:46.895988",
> "log_size": 3094,
> "ondisk_log_size": 3094,
> "stats_invalid": false,
> "dirty_stats_invalid": false,
> "omap_stats_invalid": false,
> "hitset_stats_invalid": false,
> "hitset_bytes_stats_invalid": false,
> "pin_stats_invalid": false,
> "manifest_stats_invalid": false,
> "snaptrimq_len": 0,
> "stat_sum": {
> "num_bytes": 15173849600,
> "num_objects": 3647,
> "num_object_clones": 0,
> "num_object_copies": 10941,
> "num_objects_missing_on_primary": 0,
> "num_objects_missing": 0,
> "num_objects_degraded": 0,
> "num_objects_misplaced": 0,
> "num_objects_unfound": 0,
> "num_objects_dirty": 3647,
> "num_whiteouts": 0,
> "num_read": 172836,
> "num_read_kb": 6824184,
> "num_write": 196190,
> "num_write_kb": 21380176,
> "num_scrub_errors": 0,
> "num_shallow_scrub_errors": 0,
> "num_deep_scrub_errors": 0,
> "num_objects_recovered": 0,
> "num_bytes_recovered": 0,
> "num_keys_recovered": 0,
> "num_objects_omap": 0,
> "num_objects_hit_set_archive": 0,
> "num_bytes_hit_set_archive": 0,
> "num_flush": 0,
> "num_flush_kb": 0,
> "num_evict": 0,
> "num_evict_kb": 0,
> "num_promote": 0,
> "num_flush_mode_high": 0,
> "num_flush_mode_low": 0,
> "num_evict_mode_some": 0,
> "num_evict_mode_full": 0,
> "num_objects_pinned": 0,
> "num_legacy_snapsets": 0,
> "num_large_omap_objects": 0,
> "num_objects_manifest": 0,
> "num_omap_bytes": 0,
> "num_omap_keys": 0,
> "num_objects_repaired": 0
> },
> "up": [
> 261,
> 284,
> 271
> ],
> "acting": [
> 261,
> 284,
> 271
> ],
> "avail_no_missing": [],
> "object_location_counts": [],
> "blocked_by": [
> 271,
> 284
> ],
> "up_primary": 261,
> "acting_primary": 261,
> "purged_snaps": []
> },
> "empty": 0,
> "dne": 0,
> "incomplete": 0,
> "last_epoch_started": 69422,
> "hit_set_history": {
> "current_last_update": "0'0",
> "history": []
> }
> }
>
>
>
>
> {
> "pgid": "28.29d",
> "last_update": "68160'205094",
> "last_complete": "68160'205094",
> "log_tail": "68062'202000",
> "last_user_version": 205094,
> "last_backfill": "MAX",
> "last_backfill_bitwise": 0,
> "purged_snaps": [
> {
> "start": "1",
> "length": "3"
> }
> ],
> "history": {
> "epoch_created": 67698,
> "epoch_pool_created": 67698,
> "last_epoch_started": 68871,
> "last_interval_started": 68851,
> "last_epoch_clean": 67746,
> "last_interval_clean": 67745,
> "last_epoch_split": 0,
> "last_epoch_marked_full": 0,
> "same_up_since": 69630,
> "same_interval_since": 69630,
> "same_primary_since": 69628,
> "last_scrub": "68062'199623",
> "last_scrub_stamp": "2020-11-03 03:32:46.895988",
> "last_deep_scrub": "68062'177321",
> "last_deep_scrub_stamp": "2020-11-02 01:07:15.963916",
> "last_clean_scrub_stamp": "2020-11-03 03:32:46.895988"
> },
> "stats": {
> "version": "68160'205094",
> "reported_seq": "378445",
> "reported_epoch": "69627",
> "state": "peering",
> "last_fresh": "2020-11-03 21:15:08.819278",
> "last_change": "2020-11-03 21:14:18.360957",
> "last_active": "2020-11-03 15:26:24.270088",
> "last_peered": "2020-11-03 19:04:43.152655",
> "last_clean": "2020-11-03 14:45:02.988293",
> "last_became_active": "2020-09-01 13:52:40.091759",
> "last_became_peered": "2020-11-03 19:04:42.939991",
> "last_unstale": "2020-11-03 21:15:08.819278",
> "last_undegraded": "2020-11-03 21:15:08.819278",
> "last_fullsized": "2020-11-03 21:15:08.819278",
> "mapping_epoch": 69630,
> "log_start": "68062'202000",
> "ondisk_log_start": "68062'202000",
> "created": 67698,
> "last_epoch_clean": 67746,
> "parent": "0.0",
> "parent_split_bits": 0,
> "last_scrub": "68062'199623",
> "last_scrub_stamp": "2020-11-03 03:32:46.895988",
> "last_deep_scrub": "68062'177321",
> "last_deep_scrub_stamp": "2020-11-02 01:07:15.963916",
> "last_clean_scrub_stamp": "2020-11-03 03:32:46.895988",
> "log_size": 3094,
> "ondisk_log_size": 3094,
> "stats_invalid": false,
> "dirty_stats_invalid": false,
> "omap_stats_invalid": false,
> "hitset_stats_invalid": false,
> "hitset_bytes_stats_invalid": false,
> "pin_stats_invalid": false,
> "manifest_stats_invalid": false,
> "snaptrimq_len": 0,
> "stat_sum": {
> "num_bytes": 15173849600,
> "num_objects": 3647,
> "num_object_clones": 0,
> "num_object_copies": 10941,
> "num_objects_missing_on_primary": 0,
> "num_objects_missing": 0,
> "num_objects_degraded": 0,
> "num_objects_misplaced": 0,
> "num_objects_unfound": 0,
> "num_objects_dirty": 3647,
> "num_whiteouts": 0,
> "num_read": 172836,
> "num_read_kb": 6824184,
> "num_write": 196190,
> "num_write_kb": 21380176,
> "num_scrub_errors": 0,
> "num_shallow_scrub_errors": 0,
> "num_deep_scrub_errors": 0,
> "num_objects_recovered": 0,
> "num_bytes_recovered": 0,
> "num_keys_recovered": 0,
> "num_objects_omap": 0,
> "num_objects_hit_set_archive": 0,
> "num_bytes_hit_set_archive": 0,
> "num_flush": 0,
> "num_flush_kb": 0,
> "num_evict": 0,
> "num_evict_kb": 0,
> "num_promote": 0,
> "num_flush_mode_high": 0,
> "num_flush_mode_low": 0,
> "num_evict_mode_some": 0,
> "num_evict_mode_full": 0,
> "num_objects_pinned": 0,
> "num_legacy_snapsets": 0,
> "num_large_omap_objects": 0,
> "num_objects_manifest": 0,
> "num_omap_bytes": 0,
> "num_omap_keys": 0,
> "num_objects_repaired": 0
> },
> "up": [
> 261,
> 284
> ],
> "acting": [
> 261,
> 284
> ],
> "avail_no_missing": [],
> "object_location_counts": [],
> "blocked_by": [
> 271
> ],
> "up_primary": 261,
> "acting_primary": 261,
> "purged_snaps": []
> },
> "empty": 0,
> "dne": 0,
> "incomplete": 0,
> "last_epoch_started": 69392,
> "hit_set_history": {
> "current_last_update": "0'0",
> "history": []
> }
> }
>
>
>
>
> {
> "pgid": "28.29d",
> "last_update": "68160'205094",
> "last_complete": "68160'205094",
> "log_tail": "68062'202000",
> "last_user_version": 205094,
> "last_backfill": "MAX",
> "last_backfill_bitwise": 0,
> "purged_snaps": [
> {
> "start": "1",
> "length": "3"
> }
> ],
> "history": {
> "epoch_created": 67698,
> "epoch_pool_created": 67698,
> "last_epoch_started": 68871,
> "last_interval_started": 68851,
> "last_epoch_clean": 67746,
> "last_interval_clean": 67745,
> "last_epoch_split": 0,
> "last_epoch_marked_full": 0,
> "same_up_since": 69411,
> "same_interval_since": 69411,
> "same_primary_since": 69411,
> "last_scrub": "68062'199623",
> "last_scrub_stamp": "2020-11-03 03:32:46.895988",
> "last_deep_scrub": "68062'177321",
> "last_deep_scrub_stamp": "2020-11-02 01:07:15.963916",
> "last_clean_scrub_stamp": "2020-11-03 03:32:46.895988"
> },
> "stats": {
> "version": "68070'205093",
> "reported_seq": "378344",
> "reported_epoch": "68160",
> "state": "active+clean",
> "last_fresh": "2020-11-03 14:45:02.988293",
> "last_change": "2020-11-03 03:32:46.896044",
> "last_active": "2020-11-03 14:45:02.988293",
> "last_peered": "2020-11-03 14:45:02.988293",
> "last_clean": "2020-11-03 14:45:02.988293",
> "last_became_active": "2020-09-01 13:52:40.091759",
> "last_became_peered": "2020-09-01 13:52:40.091759",
> "last_unstale": "2020-11-03 14:45:02.988293",
> "last_undegraded": "2020-11-03 14:45:02.988293",
> "last_fullsized": "2020-11-03 14:45:02.988293",
> "mapping_epoch": 69411,
> "log_start": "68062'202000",
> "ondisk_log_start": "68062'202000",
> "created": 67698,
> "last_epoch_clean": 67746,
> "parent": "0.0",
> "parent_split_bits": 0,
> "last_scrub": "68062'199623",
> "last_scrub_stamp": "2020-11-03 03:32:46.895988",
> "last_deep_scrub": "68062'177321",
> "last_deep_scrub_stamp": "2020-11-02 01:07:15.963916",
> "last_clean_scrub_stamp": "2020-11-03 03:32:46.895988",
> "log_size": 3093,
> "ondisk_log_size": 3093,
> "stats_invalid": false,
> "dirty_stats_invalid": false,
> "omap_stats_invalid": false,
> "hitset_stats_invalid": false,
> "hitset_bytes_stats_invalid": false,
> "pin_stats_invalid": false,
> "manifest_stats_invalid": false,
> "snaptrimq_len": 0,
> "stat_sum": {
> "num_bytes": 15173849600,
> "num_objects": 3647,
> "num_object_clones": 0,
> "num_object_copies": 10941,
> "num_objects_missing_on_primary": 0,
> "num_objects_missing": 0,
> "num_objects_degraded": 0,
> "num_objects_misplaced": 0,
> "num_objects_unfound": 0,
> "num_objects_dirty": 3647,
> "num_whiteouts": 0,
> "num_read": 172836,
> "num_read_kb": 6824184,
> "num_write": 196190,
> "num_write_kb": 21380176,
> "num_scrub_errors": 0,
> "num_shallow_scrub_errors": 0,
> "num_deep_scrub_errors": 0,
> "num_objects_recovered": 0,
> "num_bytes_recovered": 0,
> "num_keys_recovered": 0,
> "num_objects_omap": 0,
> "num_objects_hit_set_archive": 0,
> "num_bytes_hit_set_archive": 0,
> "num_flush": 0,
> "num_flush_kb": 0,
> "num_evict": 0,
> "num_evict_kb": 0,
> "num_promote": 0,
> "num_flush_mode_high": 0,
> "num_flush_mode_low": 0,
> "num_evict_mode_some": 0,
> "num_evict_mode_full": 0,
> "num_objects_pinned": 0,
> "num_legacy_snapsets": 0,
> "num_large_omap_objects": 0,
> "num_objects_manifest": 0,
> "num_omap_bytes": 0,
> "num_omap_keys": 0,
> "num_objects_repaired": 0
> },
> "up": [
> 261,
> 284,
> 271
> ],
> "acting": [
> 261,
> 284,
> 271
> ],
> "avail_no_missing": [],
> "object_location_counts": [],
> "blocked_by": [],
> "up_primary": 261,
> "acting_primary": 261,
> "purged_snaps": []
> },
> "empty": 0,
> "dne": 0,
> "incomplete": 0,
> "last_epoch_started": 67746,
> "hit_set_history": {
> "current_last_update": "0'0",
> "history": []
> }
> }
>
>
>
> Current status of the cluster:
>             Reduced data availability: 1021 pgs inactive, 999 pgs peering
>             Degraded data redundancy: 18357/94939584 objects  
> degraded (0.019%), 3 pgs degraded, 5 pgs undersized
>
>   services:
>     mon: 3 daemons, quorum monb01,monb02,monb03
>     mgr: monb03(active), standbys: monb01, monb02
>     osd: 285 osds: 284 up, 284 in
>
>   data:
>     pools:   9 pools, 9546 pgs
>     objects: 31.65 M objects, 120 TiB
>     usage:   363 TiB used, 127 TiB / 490 TiB avail
>     pgs:     10.696% pgs not active
>              18357/94939584 objects degraded (0.019%)
>              8520 active+clean
>              999  peering
>              18   activating
>              3    active+clean+scrubbing+deep
>              2    activating+undersized+degraded
>              2    activating+undersized
>              1    active+clean+scrubbing
>              1    active+undersized+degraded
>
>   io:
>     client:   367 MiB/s rd, 195 MiB/s wr, 24.51 kop/s rd, 5.95 kop/s wr
>     cache:    24 MiB/s flush, 90 MiB/s evict, 23 op/s promote
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