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Applies to SUSE Enterprise Storage 7

9 Troubleshooting Ceph health status Edit source

The following section details the statues that have been triggered and actions to take when the status is displayed.

MONITOR
MON_DOWN

One or more monitor daemons are down. The cluster requires a majority of the monitors in order to function. When one or more monitors are down, clients will initially have difficulty connecting to the cluster.

Restart the monitor daemon that is down as soon as possible to reduce the risk of a subsequent monitor failure.

MON_CLOCK_SKEW

The clocks on the hosts running the ceph-mon monitor daemons are not well synchronized. This health alert is raised if the cluster detects a clock skew greater than mon_clock_drift_allowed. Resolve this by synchronizing the clocks using either ntpd or chrony. If it is impractical to keep the clocks closely synchronized, the mon_clock_drift_allowed threshold can be increased, but this value must stay well below the mon_lease interval in order for monitor cluster to function properly.

MON_MSGR2_NOT_ENABLED

The ms_bind_msgr2 option is enabled but one or more monitors is not configured to bind to a v2 port in the cluster's monmap. This means that features specific to the msgr2 protocol (for example, encryption) are not available on some or all connections. In most cases this can be corrected by issuing the following command:

cephuser@adm > ceph mon enable-msgr2

This command changes any monitor configured for the old default port 6789 to continue to listen for v1 connections on 6789 and also listen for v2 connections on the new default 3300 port. If a monitor is configured to listen for v1 connections on a non-standard port (not 6789), then the monmap needs to be modified manually.

MANAGER
MGR_MODULE_DEPENDENCY

An enabled manager module is failing its dependency check. This health check should come with a message from the module about the problem. For example, a module might report that a required package is not installed. In which case, the message will read: "Install the required package and restart your manager daemons." This health check only applies to enabled modules. If a module is not enabled, you can see whether it is reporting dependency issues in the output of ceph module ls.

MGR_MODULE_ERROR

A manager module has experienced an unexpected error. Typically, this means an unhandled exception was raised from the module's serve function. The human-readable description of the error may be obscurely worded if the exception did not provide a useful description of itself. This health check may indicate a bug. Open a bug report if you think you have encountered a bug. If you believe the error is transient, you may restart your manager daemon(s), or use ceph mgr fail on the active daemon to prompt a failover to another daemon.

OSDS
OSD_DOWN

One or more OSDs are marked down. The ceph-osd daemon may have been stopped, or peer OSDs may be unable to reach the OSD over the network. Common causes include a stopped or crashed daemon, a down host, or a network outage. Verify the host is healthy, the daemon is started, and network is functioning. If the daemon has crashed, the daemon log file (/var/log/ceph/ceph-osd.*) may contain debugging information.

OSD_CRUSH TYPE_DOWN

For example, OSD_HOST_DOWN or OSD_ROOT_DOWN. All the OSDs within a particular CRUSH subtree are marked down, for example all OSDs on a host.

OSD_ORPHAN

An OSD is referenced in the CRUSH Map hierarchy but does not exist. The OSD can be removed from the CRUSH hierarchy with:

cephuser@adm > ceph osd crush rm osd.ID
OSD_OUT_OF_ORDER_FULL

The utilization thresholds for backfillfull, nearfull, full, and failsafe_full are not ascending. The thresholds can be adjusted with:

cephuser@adm > ceph osd set-backfillfull-ratio RATIO
cephuser@adm > ceph osd set-nearfull-ratio RATIO
cephuser@adm > ceph osd set-full-ratio RATIO
OSD_FULL

One or more OSDs have exceeded the full threshold and is preventing the cluster from servicing writes. Utilization by pool can be checked with:

cephuser@adm > ceph df

The currently defined full ratio can be seen with:

cephuser@adm > ceph osd dump | grep full_ratio

A short-term workaround to restore write availability is to raise the full threshold by a small amount:

cephuser@adm > ceph osd set-full-ratio RATIO

New storage should be added to the cluster by deploying more OSDs or existing data should be deleted in order to free up space.

OSD_BACKFILLFULL

One or more OSDs have exceeded the backfillfull threshold, preventing data from being allowed to rebalance to this device. This is an early warning that rebalancing may not be able to complete and that the cluster is approaching full. Utilization by pool can be checked with:

cephuser@adm > ceph df
OSD_NEARFULL

One or more OSDs have exceeded the nearfull threshold. This is an early warning that the cluster is approaching full. Utilization by pool can be checked with:

cephuser@adm > ceph df
OSDMAP_FLAGS

One or more cluster flags of interest has been set. These flags include:

full

The cluster is flagged as full and cannot serve writes

pauserd, pausewr

Paused reads or writes

noup

OSDs are not allowed to start

nodown

OSD failure reports are being ignored and the monitors are not marking OSDs down

noin

OSDs that were previously marked out are not being marked back in when they start

noout

Down OSDs are not automatically marked out after the configured interval

nobackfill, norecover, norebalance

Recovery or data rebalancing is suspended

noscrub, nodeep_scrub

Scrubbing is disabled

notieragent

Cache tiering activity is suspended

With the exception of full, these flags can be set or cleared with:

cephuser@adm > ceph osd set FLAG
cephuser@adm > ceph osd unset FLAG
OSD_FLAGS

One or more OSDs or CRUSH {nodes,device classes} has a flag of interest set. These flags include:

noup

These OSDs are not allowed to start

nodown

Failure reports for these OSDs are ignored

noin

If these OSDs were previously marked out automatically after a failure, they are not to be marked in when they start

noout

If these OSDs are down they are not automatically marked out after the configured interval

These flags can be set and cleared in batch with:

cephuser@adm > ceph osd set-group FLAG WHO
cephuser@adm > ceph osd unset-group FLAG WHO

For example:

cephuser@adm > ceph osd set-group noup,noout osd.0 osd.1
cephuser@adm > ceph osd unset-group noup,noout osd.0 osd.1
cephuser@adm > ceph osd set-group noup,noout host-foo
cephuser@adm > ceph osd unset-group noup,noout host-foo
cephuser@adm > ceph osd set-group noup,noout class-hdd
cephuser@adm > ceph osd unset-group noup,noout class-hdd
OLD_CRUSH_TUNABLES

The CRUSH Map is using old settings and should be updated. The oldest tunables that can be used (for example, the oldest client version that can connect to the cluster) without triggering this health warning are determined by the mon_crush_min_required_version config option.

OLD_CRUSH_STRAW_CALC_VERSION

The CRUSH Map is using an older, sub-optimal method for calculating intermediate weight values for straw buckets. The CRUSH Map requires an update to use the newer method (straw_calc_version=1).

CACHE_POOL_NO_HIT_SET

One or more cache pools are not configured with a hit set to track utilization. This prevents the tiering agent from identifying cold objects to flush and evict from the cache. Hit sets can be configured on the cache pool with the following:

cephuser@adm > ceph osd pool set POOLNAME hit_set_type TYPE
cephuser@adm > ceph osd pool set POOLNAME hit_set_period PERIOD-IN-SECONDS
cephuser@adm > ceph osd pool set POOLNAME hit_set_count NUMBER-OF-HITSETS
cephuser@adm > ceph osd pool set POOLNAME hit_set_fpp TARGET-FALSE-POSITIVE-RATE
OSD_NO_SORTBITWISE

No SUSE Enterprise Storage 6 v12.y.z OSDs are running but the sortbitwise flag has not been set. Set the sortbitwise flag before v12.y.z or newer OSDs can start. You can safely set the flag with:

cephuser@adm > ceph osd set sortbitwise
POOL_FULL

One or more pools have reached the quota and are no longer allowing writes. Pool quotas and utilization can be seen with the following command:

cephuser@adm > ceph df detail

You can either raise the pool quota with the following commands:

cephuser@adm > ceph osd pool set-quota POOLNAME max_objects NUM-OBJECTS
cephuser@adm > ceph osd pool set-quota POOLNAME max_bytes NUM-BYTES

Or, you can delete existing data to reduce utilization.

BLUEFS_SPILLOVER

One or more OSDs that use the BlueStore backend have been allocated db partitions (storage space for metadata, normally on a faster device) but that space has filled, such that metadata has overflowed onto the normal slow device. This is not necessarily an error condition or even unexpected, but if the administrator's expectation was that all metadata would fit on the faster device, it indicates that not enough space was provided. This warning can be disabled on all OSDs with the following command:

cephuser@adm > ceph config set osd bluestore_warn_on_bluefs_spillover false

Alternatively, it can be disabled on a specific OSD with the following command:

cephuser@adm > ceph config set osd.123 bluestore_warn_on_bluefs_spillover false

To provide more metadata space, the OSD in question can be destroyed and reprovisioned. This involves data migration and recovery. It is possible to expand the LVM logical volume backing the db storage. If the underlying LV has been expanded, the OSD daemon needs to be stopped and BlueFS informed of the device size change with the following command:

cephuser@adm > ceph-bluestore-tool bluefs-bdev-expand --path /var/lib/ceph/osd/ceph-$ID
BLUEFS_AVAILABLE_SPACE

To check how much space is free for BlueFS, execute:

cephuser@adm > ceph daemon osd.123 bluestore bluefs available

This provides output for up to 3 values; BDEV_DB free, BDEV_SLOW free and available_from_bluestore. BDEV_DB and BDEV_SLOW report the amount of space that has been acquired by BlueFS and is considered free. Value available_from_bluestore denotes ability of BlueStore to leave more space to BlueFS. It is normal that this value is different from amount of BlueStore free space, as BlueFS allocation unit is typically larger than BlueStore allocation unit. This means that only part of BlueStore free space is acceptable for BlueFS.

BLUEFS_LOW_SPACE

If BlueFS is running low on available free space and there is little available_from_bluestore, consider reducing BlueFS' allocation unit size. To simulate available space when the allocation unit is different, execute:

cephuser@adm > ceph daemon osd.123 bluestore bluefs available ALLOC-UNIT-SIZE
BLUESTORE_FRAGMENTATION

As BlueStore works, free space on underlying storage becomes fragmented. This is normal and unavoidable, but excessive fragmentation can cause slowdown. To inspect BlueStore fragmentation, execute:

cephuser@adm > ceph daemon osd.123 bluestore allocator score block

Score is given in [0-1] range. [0.0 .. 0.4] tiny fragmentation [0.4 .. 0.7] small, acceptable fragmentation [0.7 .. 0.9] considerable, but safe fragmentation [0.9 .. 1.0] severe fragmentation, can impact BlueFS' ability to get space from BlueStore. If detailed report of free fragments is required, execute:

cephuser@adm > ceph daemon osd.123 bluestore allocator dump block

If the OSD process does not perform fragmentation, inspect with ceph-bluestore-tool. Get the fragmentation score:

cephuser@adm > ceph-bluestore-tool --path /var/lib/ceph/osd/ceph-123 --allocator block free-score

Dump detailed free chunks:

cephuser@adm > ceph-bluestore-tool --path /var/lib/ceph/osd/ceph-123 --allocator block free-dump
BLUESTORE_LEGACY_STATFS

As of SUSE Enterprise Storage 6, BlueStore tracks its internal usage statistics on a per-pool granular basis and one or more OSDs have BlueStore volumes that were created prior to SUSE Enterprise Storage 7. If all OSDs are older than SUSE Enterprise Storage 7, the per-pool metrics are not available. However, if there is a mix of pre-SUSE Enterprise Storage 7 and post-SUSE Enterprise Storage 7 OSDs, the cluster usage statistics reported by ceph df will not be accurate. The old OSDs can be updated to use the new usage tracking scheme by stopping each OSD, running a repair operation, and the restarting it. For example, if osd.123 requires an update, run the following command. To identify the unique FSID of the cluster, run ceph fsid. To identify the Object Gateway daemon name, run ceph orch ps ---hostname HOSTNAME.

root # systemctl stop ceph-FSID@osd.123
cephuser@adm > ceph-bluestore-tool repair --path /var/lib/ceph/osd/ceph-123
root # systemctl start ceph-osd@123

This warning can be disabled with:

cephuser@adm > ceph config set global bluestore_warn_on_legacy_statfs false
BLUESTORE_DISK_SIZE_MISMATCH

One or more OSDs using BlueStore has an internal inconsistency between the size of the physical device and the metadata tracking its size. This can lead to the OSD crashing in the future. The OSDs in question should be destroyed and re-deployed. To avoid putting any data at risk, re-deploy only one OSD at a time. For example, if OSD_ID has the error:

cephuser@adm > ceph osd out osd.OSD_ID
cephuser@adm > while ! ceph osd safe-to-destroy osd.OSD_ID ; do sleep 1m ; done
cephuser@adm > ceph osd destroy osd.OSD_ID
cephuser@adm > cephadm ceph-volume lvm zap /path/to/device
cephuser@adm > cephadm ceph-volume lvm create --osd-id  OSD_ID--data /path/to/device
DEVICE HEALTH
DEVICE_HEALTH

One or more devices are expected to fail. The warning threshold is controlled by the mgr/devicehealth/warn_threshold configuration option. This warning only applies to OSDs that are currently marked in. The expected response to this failure is to mark the device out. The data is then migrated off of the device and the hardware is removed from the system. Marking out is normally done automatically if mgr/devicehealth/self_heal is enabled based on the mgr/devicehealth/mark_out_threshold. Device health can be checked with:

cephuser@adm > ceph device info DEVICE-ID

Device life expectancy is set by a prediction model run by the Ceph Manager or by an external tool via the command:

cephuser@adm > ceph device set-life-expectancy DEVICE-ID FROM TO

You can change the stored life expectancy manually, but that usually does not persist—the tool that originally set it reset and changing the stored value does not affect the actual health of the hardware device.

DEVICE_HEALTH_IN_USE

One or more devices are expected to fail and has been marked out of the cluster based on mgr/devicehealth/mark_out_threshold, but the devices are still participating in one more PGs. This may be because it was only recently marked as out and the data is still migrating, or because the data cannot be migrated off for some reason (for example, the cluster is nearly full, or the CRUSH hierarchy is such that there is not another suitable OSD to migrate the data to). This message can be silenced by disabling the self heal behavior (setting mgr/devicehealth/self_heal to false), by adjusting the mgr/devicehealth/mark_out_threshold, or by addressing what is preventing data from being migrated off of the ailing device.

DEVICE_HEALTH_TOOMANY

Too many devices are expected to fail and the mgr/devicehealth/self_heal behavior is enabled, such that marking out all of the ailing devices would exceed the clusters mon_osd_min_in_ratio ratio that prevents too many OSDs from being automatically marked out. This can indicates that too many devices in the cluster are expected to fail and action is required to add newer (healthier) devices before too many devices fail and data is lost. The health message can also be silenced by adjusting parameters like mon_osd_min_in_ratio or mgr/devicehealth/mark_out_threshold, but be warned that this increases the likelihood of unrecoverable data loss in the cluster.

DATA HEALTH (POOLS AND PLACEMENT GROUPS)
PG_AVAILABILITY

Data availability is reduced and the cluster is unable to service potential read or write requests for some data in the cluster. Specifically, if one or more PGs are in a state that does not allow IO requests to be serviced. Problematic PG states include peering, stale, incomplete, and in-active (if those conditions do not clear quickly). Detailed information about which PGs are affected is available from:

cephuser@adm > ceph health detail

In most cases the root cause is that one or more OSDs are currently down; see the discussion for OSD_DOWN above. The state of specific problematic PGs can be queried with:

cephuser@adm > ceph tell PG_ID query
PG_DEGRADED

Data redundancy is reduced for some data, meaning the cluster does not have the desired number of replicas for all data (for replicated pools) or erasure code fragments (for erasure coded pools). Specifically, if one or more PGs:

  • have a degraded or undersized flag set, meaning there are not enough instances of that placement group in the cluster;

  • have not had the clean flag set for some time.

PG_RECOVERY_FULL

Data redundancy can be reduced or at risk for some data due to a lack of free space in the cluster. Specifically, one or more PGs have the recovery_toofull flag set, meaning that the cluster is unable to migrate or recover data because one or more OSDs are above the full threshold. See the discussion for OSD_FULL above for steps to resolve this condition.

PG_BACKFILL_FULL

Data redundancy can be reduced or at risk for some data due to a lack of free space in the cluster. Specifically, one or more PGs have the backfill_toofull flag set, meaning that the cluster is unable to migrate or recover data because one or more OSDs are above the backfillfull threshold. See the discussion for OSD_BACKFILLFULL above for steps to resolve this condition.

PG_DAMAGED

Data scrubbing has discovered some problems with data consistency in the cluster. Specifically, one or more PGs have the inconsistent or snaptrim_error flag is set, indicating an earlier scrub operation found a problem, or that the repair flag is set and a repair for such an inconsistency is currently in progress.

OSD_SCRUB_ERRORS

Recent OSD scrubs have uncovered inconsistencies. This error is generally paired with PG_DAMAGED.

LARGE_OMAP_OBJECTS

One or more pools contain large omap objects as determined by osd_deep_scrub_large_omap_object_key_threshold (threshold for number of keys to determine a large omap object) or osd_deep_scrub_large_omap_object_value_sum_threshold (the threshold for summed size (bytes) of all key values to determine a large omap object) or both. More information on the object name, key count, and size in bytes can be found by searching the cluster log for ‘Large omap object found'. Large omap objects can be caused by RGW bucket index objects that do not have automatic resharding enabled. The thresholds can be adjusted with:

cephuser@adm > ceph config set osd osd_deep_scrub_large_omap_object_key_threshold KEYS
cephuser@adm > ceph config set osd osd_deep_scrub_large_omap_object_value_sum_threshold BYTES
CACHE_POOL_NEAR_FULL

A cache tier pool is nearly full. Full is determined by the target_max_bytes and target_max_objects properties on the cache pool. Once the pool reaches the target threshold, write requests to the pool may block while data is flushed and evicted from the cache, a state that normally leads to very high latencies and poor performance. The cache pool target size can be adjusted with:

cephuser@adm > ceph osd pool set CACHE-POOL-NAME target_max_bytes BYTES
cephuser@adm > ceph osd pool set CACHE-POOL-NAME target_max_objects OBJECTS

Normal cache flush and eviction activity can also be throttled due to reduced availability, performance of the base tier, or overall cluster load.

POOL_TOO_FEW_PGS

One or more pools should probably have more PGs, based on the amount of data that is currently stored in the pool. This can lead to sub-optimal distribution and balance of data across the OSDs in the cluster, and similarly reduce overall performance. This warning is generated if the pg_autoscale_mode property on the pool is set to warn. To disable the warning, you can disable auto-scaling of PGs for the pool entirely with:

cephuser@adm > ceph osd pool set POOL-NAME pg_autoscale_mode off

To allow the cluster to automatically adjust the number of PGs:

cephuser@adm > ceph osd pool set POOL-NAME pg_autoscale_mode on

You can also manually set the number of PGs for the pool to the recommended amount with:

cephuser@adm > ceph osd pool set POOL_NAME pg_num NEW_PG_NUM
TOO_MANY_PGS

The number of PGs in use in the cluster is above the configurable threshold of mon_max_pg_per_osd PGs per OSD. If this threshold is exceeded, the cluster does not allow new pools to be created, pool pg_num to be increased, or pool replication to be increased (any of which would lead to more PGs in the cluster). A large number of PGs can lead to higher memory utilization for OSD daemons, slower peering after cluster state changes (like OSD restarts, additions, or removals), and higher load on the Ceph Manager and Ceph Monitor daemons. The simplest way to mitigate the problem is to increase the number of OSDs in the cluster by adding more hardware. The OSD count used for the purposes of this health check is the number of in OSDs, marking out OSDs in (if there are any) can also help:

cephuser@adm > ceph osd in OSD_IDs
POOL_TOO_MANY_PGS

One or more pools require more PGs based on the amount of data that is currently stored in the pool. This can lead to higher memory utilization for OSD daemons, slower peering after cluster state changes (like OSD restarts, additions, or removals), and higher load on the manager and monitor daemons. This warning is generated if the pg_autoscale_mode property on the pool is set to warn. To disable the warning, you can disable auto-scaling of PGs for the pool entirely with:

cephuser@adm > ceph osd pool set POOL_NAME pg_autoscale_mode off

To allow the cluster to automatically adjust the number of PGs:

cephuser@adm > ceph osd pool set POOL_NAME pg_autoscale_mode on

You can also manually set the number of PGs for the pool to the recommended amount with:

cephuser@adm > ceph osd pool set POOL_NAME pg_num NEW_PG_-NUM
POOL_TARGET_SIZE_RATIO_OVERCOMMITTED

One or more pools have a target_size_ratio property set to estimate the expected size of the pool as a fraction of total storage, but the value(s) exceed the total available storage (either by themselves or in combination with other pools' actual usage). This can indicate that the target_size_ratio value for the pool is too large, and should be reduced or set to zero with:

cephuser@adm > ceph osd pool set POOL-NAME target_size_ratio 0
POOL_TARGET_SIZE_BYTES_OVERCOMMITTED

One or more pools have a target_size_bytes property set to estimate the expected size of the pool, but the value(s) exceed the total available storage (either by themselves or in combination with other pools' actual usage). This indicates that the target_size_bytes value for the pool is too large and should be reduced or set to zero with:

cephuser@adm > ceph osd pool set POOL-NAME target_size_bytes 0
TOO_FEW_OSDS

The number of OSDs in the cluster is below the configurable threshold of osd_pool_default_size.

SMALLER_PGP_NUM

One or more pools have a pgp_num value less than pg_num, indicating that the PG count was increased without also increasing the placement behavior. To adjust the placement group number, adjust pgp_num and pg_num. Ensure that changing pgp_num is performed first and does not trigger the rebalance. To resolve, set pgp_num to match pg_num and trigger the data migration with:

cephuser@adm > ceph osd pool set POOL pgp_num PG_NUM_VALUE
MANY_OBJECTS_PER_PG

One or more pools has an average number of objects per PG that is significantly higher than the overall cluster average. The specific threshold is controlled by the mon_pg_warn_max_object_skew configuration value. This indicates that the pool(s) containing most of the data in the cluster have too few PGs, or that other pools that do not contain as much data have too many PGs. The threshold can be raised to silence the health warning by adjusting the mon_pg_warn_max_object_skew configuration option on the monitors.

POOL_APP_NOT_ENABLED

A pool exists that contains one or more objects but has not been tagged for use by a particular application. Resolve this warning by labeling the pool for use by an application. For example, if the pool is used by RBD:

cephuser@adm > rbd pool init POOLNAME

If the pool is being used by a custom application FOO, you can also label via the low-level command:

cephuser@adm > ceph osd pool application enable FOO
POOL_FULL

One or more pools has reached (or is very close to reaching) its quota. The threshold to trigger this error condition is controlled by the mon_pool_quota_crit_threshold configuration option. Pool quotas can be adjusted up or down (or removed) with:

cephuser@adm > ceph osd pool set-quota POOL max_bytes BYTES
cephuser@adm > ceph osd pool set-quota POOL max_objects OBJECTS

Setting the quota value to 0 disables the quota.

POOL_NEAR_FULL

One or more pools are approaching its quota. The threshold to trigger this warning condition is controlled by the mon_pool_quota_warn_threshold configuration option. Pool quotas can be adjusted up or down (or removed) with:

cephuser@adm > ceph osd pool set-quota POOL max_bytes BYTES
cephuser@adm > ceph osd pool set-quota POOL max_objects OBJECTS
OBJECT_MISPLACED

One or more objects in the cluster is not stored on the node the cluster would like it to be stored on. This is an indication that data migration due to some recent cluster change has not yet completed. Misplaced data is not a dangerous condition in and of itself. Data consistency is not at risk and old copies of objects are not removed until the desired number of new copies (in the desired locations) are present.

OBJECT_UNFOUND

One or more objects in the cluster cannot be found. Specifically, the OSDs know that a new or updated copy of an object should exist, but a copy of that version of the object has not been found on OSDs that are currently online. Read or write requests to unfound objects will block. Ideally, a down OSD can be brought back online that has the more recent copy of the unfound object. Candidate OSDs can be identified from the peering state for the PG(s) responsible for the unfound object:

cephuser@adm > ceph tell PG_ID query

If the latest copy of the object is not available, the cluster can be told to roll back to a previous version of the object.

SLOW_OPS

One or more OSD requests is taking a long time to process. This can be an indication of extreme load, a slow storage device, or a software bug. The request queue on the OSD(s) in question can be queried with the following command, executed from the OSD host:

cephuser@adm > ceph daemon osd.ID ops

A summary of the slowest recent requests can be seen with:

cephuser@adm > ceph daemon osd.ID dump_historic_ops

The location of an OSD can be found with:

cephuser@adm > ceph osd find osd.ID
PG_NOT_SCRUBBED

One or more PGs have not been scrubbed recently. PGs are normally scrubbed every mon_scrub_interval seconds and this warning triggers when mon_warn_pg_not_deep_scrubbed_ratio percentage of interval has elapsed without a scrub since it was due. PGs do not scrub if they are not flagged as clean. This can happen if they are misplaced or degraded (see PG_AVAILABILITY and PG_DEGRADED above). You can manually initiate a scrub of a clean PG with:

cephuser@adm > ceph pg scrub PG_ID
PG_NOT_DEEP_SCRUBBED

One or more PGs have not been deep scrubbed recently. PGs are normally scrubbed every osd_deep_scrub_interval seconds and this warning triggers when mon_warn_pg_not_deep_scrubbed_ratio percentage of interval has elapsed without a scrub since it was due. PGs do not (deep) scrub if they are not flagged as clean. This can happen if they are misplaced or degraded (see PG_AVAILABILITY and PG_DEGRADED above). You can manually initiate a scrub of a clean PG with:

cephuser@adm > ceph pg deep-scrub PG_ID
HEALTH CHECKS
CEPHADM_PAUSED

cephadm background work has been paused with ceph orch pause. cephadm continues to perform passive monitoring activities (for example, checking host and daemon status), but it will not make any changes (for example, deploying or removing daemons).

Resume cephadm work with:

cephuser@adm > ceph orch resume
CEPHADM_STRAY_HOST

One or more hosts have running Ceph daemons but are not registered as hosts managed by cephadm. This means that those services cannot currently be managed by cephadm. For example, restarted, upgraded, included in ceph orch ps.

You can manage the host(s) with:

cephuser@adm > ceph orch host add hostname
Note
Note

You may need to configure SSH access to the remote host before this will work.

Alternatively, you can manually connect to the host and ensure that services on that host are removed or migrated to a host that is managed by cephadm.

You can also disable this warning entirely with:

cephuser@adm > ceph config set mgr mgr/cephadm/warn_on_stray_hosts false
CEPHADM_STRAY_DAEMON

One or more Ceph daemons are running but not are not managed by cephadm. This may be because they were deployed using a different tool, or because they were started manually. Those services cannot currently be managed by cephadm. For example, restarted, upgraded, or included in ceph orch ps..

If the daemon is a stateful one (MON or OSD), it should be adopted by cephadm. For stateless daemons, it is usually easiest to provision a new daemon with the ceph orch apply command and then stop the unmanaged daemon.

This warning can be disabled entirely with:

cephuser@adm > ceph config set mgr mgr/cephadm/warn_on_stray_daemons false
CEPHADM_HOST_CHECK_FAILED

One or more hosts have failed the basic cephadm host check, which verifies that the host is reachable and cephadm can be executed there, and that the host satisfies basic prerequisites, like a working container runtime (podman or docker) and working time synchronization. If this test fails, cephadm will not be able to manage services on that host.

You can manually run this check with:

cephuser@adm > ceph cephadm check-host hostname

You can remove a broken host from management with:

cephuser@adm > ceph orch host rm hostname

You can disable this health warning with:

cephuser@adm > ceph config set mgr mgr/cephadm/warn_on_failed_host_check false
MISCELLANEOUS
RECENT_CRASH

One or more Ceph daemons have crashed recently, and the crash has not yet been archived or acknowledged by the administrator. This may indicate a software bug, a hardware problem (for example, a failing disk), or some other problem. New crashes can be listed with:

cephuser@adm > ceph crash ls-new

Information about a specific crash can be examined with:

cephuser@adm > ceph crash info CRASH-ID

This warning can be silenced by archiving the crash (perhaps after being examined by an administrator) so that it does not generate this warning:

cephuser@adm > ceph crash archive CRASH-ID

Similarly, all new crashes can be archived with:

cephuser@adm > ceph crash archive-all

Archived crashes are still visible via ceph crash ls but not ceph crash ls-new. The time period for what recent means is controlled by the option mgr/crash/warn_recent_interval (default: two weeks). These warnings can be disabled entirely with:

cephuser@adm > ceph config set mgr/crash/warn_recent_interval 0
TELEMETRY_CHANGED

Telemetry has been enabled but the contents of the telemetry report have changed since that time, so telemetry reports are not sent. The Ceph developers periodically revise the telemetry feature to include new and useful information, or to remove information found to be useless or sensitive. If any new information is included in the report, Ceph requires the administrator to re-enable telemetry to ensure they have an opportunity to (re)review what information is shared. To review the contents of the telemetry report:

cephuser@adm > ceph telemetry show

The telemetry report consists of several optional channels that are independently enabled or disabled. To re-enable telemetry (and make this warning go away):

cephuser@adm > ceph telemetry on

To disable telemetry (and make this warning go away):

cephuser@adm > ceph telemetry soff
 groups:
  - name: cluster health
   rules:
    - alert: health error
     expr: ceph_health_status == 2
     for: 5m
     labels:
      severity: critical
      type: ses_default
     annotations:
      description: Ceph in error for > 5m
    - alert: unhealthy
     expr: ceph_health_status != 0
     for: 15m
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: Ceph not healthy for > 5m
  - name: mon
   rules:
    - alert: low monitor quorum count
     expr: ceph_monitor_quorum_count < 3
     labels:
      severity: critical
      type: ses_default
     annotations:
      description: Monitor count in quorum is low
  - name: osd
   rules:
    - alert: 10% OSDs down
     expr: sum(ceph_osd_down) / count(ceph_osd_in) >= 0.1
     labels:
      severity: critical
      type: ses_default
     annotations:
      description: More then 10% of OSDS are down
    - alert: OSD down
     expr: sum(ceph_osd_down) > 1
     for: 15m
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: One or more OSDS down for more then 15 minutes
    - alert: OSDs near full
     expr: (ceph_osd_utilization unless on(osd) ceph_osd_down) > 80
     labels:
      severity: critical
      type: ses_default
     annotations:
      description: OSD {{ $labels.osd }} is dangerously full, over 80%
    # alert on single OSDs flapping
    - alert: flap osd
     expr: rate(ceph_osd_up[5m])*60 > 1
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: >
        OSD {{ $label.osd }} was marked down at back up at least once a
        minute for 5 minutes.
    # alert on high deviation from average PG count
    - alert: high pg count deviation
     expr: abs(((ceph_osd_pgs > 0) - on (job) group_left avg(ceph_osd_pgs > 0) by (job)) / on (job) group_left avg(ceph_osd_pgs > 0) by (job)) > 0.35
     for: 5m
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: >
        OSD {{ $labels.osd }} deviates by more then 30% from
        average PG count
    # alert on high commit latency...but how high is too high
  - name: mds
   rules:
   # no mds metrics are exported yet
  - name: mgr
   rules:
   # no mgr metrics are exported yet
  - name: pgs
   rules:
    - alert: pgs inactive
     expr: ceph_total_pgs - ceph_active_pgs > 0
     for: 5m
     labels:
      severity: critical
      type: ses_default
     annotations:
      description: One or more PGs are inactive for more then 5 minutes.
    - alert: pgs unclean
     expr: ceph_total_pgs - ceph_clean_pgs > 0
     for: 15m
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: One or more PGs are not clean for more then 15 minutes.
  - name: nodes
   rules:
    - alert: root volume full
     expr: node_filesystem_avail{mountpoint="/"} / node_filesystem_size{mountpoint="/"} < 0.1
     labels:
      severity: critical
      type: ses_default
     annotations:
      description: Root volume (OSD and MON store) is dangerously full (< 10% free)
    # alert on nic packet errors and drops rates > 1 packet/s
    - alert: network packets dropped
     expr: irate(node_network_receive_drop{device!="lo"}[5m]) + irate(node_network_transmit_drop{device!="lo"}[5m]) > 1
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: >
       Node {{ $labels.instance }} experiences packet drop > 1
       packet/s on interface {{ $lables.device }}
    - alert: network packet errors
     expr: irate(node_network_receive_errs{device!="lo"}[5m]) + irate(node_network_transmit_errs{device!="lo"}[5m]) > 1
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: >
       Node {{ $labels.instance }} experiences packet errors > 1
       packet/s on interface {{ $lables.device }}
    # predict fs fillup times
    - alert: storage filling
     expr: ((node_filesystem_free - node_filesystem_size) / deriv(node_filesystem_free[2d]) <= 5) > 0
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: >
       Mountpoint {{ $lables.mountpoint }} will be full in less then 5 days
       assuming the average fillup rate of the past 48 hours.
  - name: pools
   rules:
    - alert: pool full
     expr: ceph_pool_used_bytes / ceph_pool_available_bytes > 0.9
     labels:
      severity: critical
      type: ses_default
     annotations:
      description: Pool {{ $labels.pool }} at 90% capacity or over
    - alert: pool filling up
     expr: (-ceph_pool_used_bytes / deriv(ceph_pool_available_bytes[2d]) <= 5 ) > 0
     labels:
      severity: warning
      type: ses_default
     annotations:
      description: >
       Pool {{ $labels.pool }} will be full in less then 5 days
       assuming the average fillup rate of the past 48 hours.
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