Chapter 10. Ceph performance counters

10.1. Access to Ceph performance counters

The performance counters are available through a socket interface for the Ceph Monitors and the OSDs. The socket file for each respective daemon is located under /var/run/ceph, by default. The performance counters are grouped together into collection names. These collections names represent a subsystem or an instance of a subsystem.

Here is the full list of the Monitor and the OSD collection name categories with a brief description for each :

Monitor Collection Name Categories

Cluster Metrics - Displays information about the storage cluster: Monitors, OSDs, Pools, and PGs
Level Database Metrics - Displays information about the back-end KeyValueStore database
Monitor Metrics - Displays general monitor information
Paxos Metrics - Displays information on cluster quorum management
Throttle Metrics - Displays the statistics on how the monitor is throttling

OSD Collection Name Categories

Write Back Throttle Metrics - Displays the statistics on how the write back throttle is tracking unflushed IO
Level Database Metrics - Displays information about the back-end KeyValueStore database
Objecter Metrics - Displays information on various object-based operations
Read and Write Operations Metrics - Displays information on various read and write operations
Recovery State Metrics - Displays - Displays latencies on various recovery states
OSD Throttle Metrics - Display the statistics on how the OSD is throttling

RADOS Gateway Collection Name Categories

Object Gateway Client Metrics - Displays statistics on GET and PUT requests
Objecter Metrics - Displays information on various object-based operations
Object Gateway Throttle Metrics - Display the statistics on how the OSD is throttling

10.2. Display the Ceph performance counters

The ceph daemon DAEMON_NAME perf schema command outputs the available metrics. Each metric has an associated bit field value type.

Prerequisites

A running Red Hat Ceph Storage cluster.
Root-level access to the node.

Procedure

To view the metric’s schema:
Synatx
```
ceph daemon DAEMON_NAME perf schema
```
Note
You must run the ceph daemon command from the node running the daemon.
Executing ceph daemon DAEMON_NAME perf schema command from the monitor node:
Example
```
[ceph: root@host01 /]# ceph daemon mon.host01 perf schema
```
Executing the ceph daemon DAEMON_NAME perf schema command from the OSD node:
Example
```
[ceph: root@host01 /]# ceph daemon osd.11 perf schema
```

Table 10.1. The bit field value definitions
Bit	Meaning
`1`	`Floating point value`
`2`	`Unsigned 64-bit integer value`
`4`	`Average (Sum + Count)`
`8`	`Counter`

Each value will have bit 1 or 2 set to indicate the type, either a floating point or an integer value. When bit 4 is set, there will be two values to read, a sum and a count. When bit 8 is set, the average for the previous interval would be the sum delta, since the previous read, divided by the count delta. Alternatively, dividing the values outright would provide the lifetime average value. Typically these are used to measure latencies, the number of requests and a sum of request latencies. Some bit values are combined, for example 5, 6 and 10. A bit value of 5 is a combination of bit 1 and bit 4. This means the average will be a floating point value. A bit value of 6 is a combination of bit 2 and bit 4. This means the average value will be an integer. A bit value of 10 is a combination of bit 2 and bit 8. This means the counter value will be an integer value.

Additional Resources

See Average count and sum section in the Red Hat Ceph Storage Administration Guide for more details.

10.3. Dump the Ceph performance counters

The ceph daemon .. perf dump command outputs the current values and groups the metrics under the collection name for each subsystem.

Prerequisites

A running Red Hat Ceph Storage cluster.
Root-level access to the node.

Procedure

To view the current metric data:
Syntax
```
ceph daemon DAEMON_NAME perf dump
```
Note
You must run the ceph daemon command from the node running the daemon.
Executing ceph daemon .. perf dump command from the Monitor node:
```
[ceph: root@host01 /]# ceph daemon mon.host01 perf dump
```
Executing the ceph daemon .. perf dump command from the OSD node:
```
[ceph: root@host01 /]# ceph daemon osd.11 perf dump
```

Additional Resources

To view a short description of each Monitor metric available, please see the Ceph monitor metrics table.

10.4. Average count and sum

All latency numbers have a bit field value of 5. This field contains floating point values for the average count and sum. The avgcount is the number of operations within this range and the sum is the total latency in seconds. When dividing the sum by the avgcount this will provide you with an idea of the latency per operation.

Additional Resources

To view a short description of each OSD metric available, please see the Ceph OSD table.

10.5. Ceph Monitor metrics

Table 10.2. Cluster Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`cluster`	`num_mon`	2	Number of monitors
	`num_mon_quorum`	2	Number of monitors in quorum
	`num_osd`	2	Total number of OSD
	`num_osd_up`	2	Number of OSDs that are up
	`num_osd_in`	2	Number of OSDs that are in cluster
	`osd_epoch`	2	Current epoch of OSD map
	`osd_bytes`	2	Total capacity of cluster in bytes
	`osd_bytes_used`	2	Number of used bytes on cluster
	`osd_bytes_avail`	2	Number of available bytes on cluster
	`num_pool`	2	Number of pools
	`num_pg`	2	Total number of placement groups
	`num_pg_active_clean`	2	Number of placement groups in active+clean state
	`num_pg_active`	2	Number of placement groups in active state
	`num_pg_peering`	2	Number of placement groups in peering state
	`num_object`	2	Total number of objects on cluster
	`num_object_degraded`	2	Number of degraded (missing replicas) objects
	`num_object_misplaced`	2	Number of misplaced (wrong location in the cluster) objects
	`num_object_unfound`	2	Number of unfound objects
	`num_bytes`	2	Total number of bytes of all objects
	`num_mds_up`	2	Number of MDSs that are up
	`num_mds_in`	2	Number of MDS that are in cluster
	`num_mds_failed`	2	Number of failed MDS
	`mds_epoch`	2	Current epoch of MDS map

Table 10.3. Level Database Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`leveldb`	`leveldb_get`	10	Gets
	`leveldb_transaction`	10	Transactions
	`leveldb_compact`	10	Compactions
	`leveldb_compact_range`	10	Compactions by range
	`leveldb_compact_queue_merge`	10	Mergings of ranges in compaction queue
	`leveldb_compact_queue_len`	2	Length of compaction queue

Table 10.4. General Monitor Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`mon`	`num_sessions`	2	Current number of opened monitor sessions
	`session_add`	10	Number of created monitor sessions
	`session_rm`	10	Number of remove_session calls in monitor
	`session_trim`	10	Number of trimed monitor sessions
	`num_elections`	10	Number of elections monitor took part in
	`election_call`	10	Number of elections started by monitor
	`election_win`	10	Number of elections won by monitor
	`election_lose`	10	Number of elections lost by monitor

Table 10.5. Paxos Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`paxos`	`start_leader`	10	Starts in leader role
	`start_peon`	10	Starts in peon role
	`restart`	10	Restarts
	`refresh`	10	Refreshes
	`refresh_latency`	5	Refresh latency
	`begin`	10	Started and handled begins
	`begin_keys`	6	Keys in transaction on begin
	`begin_bytes`	6	Data in transaction on begin
	`begin_latency`	5	Latency of begin operation
	`commit`	10	Commits
	`commit_keys`	6	Keys in transaction on commit
	`commit_bytes`	6	Data in transaction on commit
	`commit_latency`	5	Commit latency
	`collect`	10	Peon collects
	`collect_keys`	6	Keys in transaction on peon collect
	`collect_bytes`	6	Data in transaction on peon collect
	`collect_latency`	5	Peon collect latency
	`collect_uncommitted`	10	Uncommitted values in started and handled collects
	`collect_timeout`	10	Collect timeouts
	`accept_timeout`	10	Accept timeouts
	`lease_ack_timeout`	10	Lease acknowledgement timeouts
	`lease_timeout`	10	Lease timeouts
	`store_state`	10	Store a shared state on disk
	`store_state_keys`	6	Keys in transaction in stored state
	`store_state_bytes`	6	Data in transaction in stored state
	`store_state_latency`	5	Storing state latency
	`share_state`	10	Sharings of state
	`share_state_keys`	6	Keys in shared state
	`share_state_bytes`	6	Data in shared state
	`new_pn`	10	New proposal number queries
	`new_pn_latency`	5	New proposal number getting latency

Table 10.6. Throttle Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`throttle-*`	`val`	10	Currently available throttle
	`max`	10	Max value for throttle
	`get`	10	Gets
	`get_sum`	10	Got data
	`get_or_fail_fail`	10	Get blocked during get_or_fail
	`get_or_fail_success`	10	Successful get during get_or_fail
	`take`	10	Takes
	`take_sum`	10	Taken data
	`put`	10	Puts
	`put_sum`	10	Put data
	`wait`	5	Waiting latency

10.6. Ceph OSD metrics

Table 10.7. Write Back Throttle Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`WBThrottle`	`bytes_dirtied`	2	Dirty data
	`bytes_wb`	2	Written data
	`ios_dirtied`	2	Dirty operations
	`ios_wb`	2	Written operations
	`inodes_dirtied`	2	Entries waiting for write
	`inodes_wb`	2	Written entries

Table 10.8. Level Database Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`leveldb`	`leveldb_get`	10	Gets
	`leveldb_transaction`	10	Transactions
	`leveldb_compact`	10	Compactions
	`leveldb_compact_range`	10	Compactions by range
	`leveldb_compact_queue_merge`	10	Mergings of ranges in compaction queue
	`leveldb_compact_queue_len`	2	Length of compaction queue

Table 10.9. Objecter Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`objecter`	`op_active`	2	Active operations
	`op_laggy`	2	Laggy operations
	`op_send`	10	Sent operations
	`op_send_bytes`	10	Sent data
	`op_resend`	10	Resent operations
	`op_ack`	10	Commit callbacks
	`op_commit`	10	Operation commits
	`op`	10	Operation
	`op_r`	10	Read operations
	`op_w`	10	Write operations
	`op_rmw`	10	Read-modify-write operations
	`op_pg`	10	PG operation
	`osdop_stat`	10	Stat operations
	`osdop_create`	10	Create object operations
	`osdop_read`	10	Read operations
	`osdop_write`	10	Write operations
	`osdop_writefull`	10	Write full object operations
	`osdop_append`	10	Append operation
	`osdop_zero`	10	Set object to zero operations
	`osdop_truncate`	10	Truncate object operations
	`osdop_delete`	10	Delete object operations
	`osdop_mapext`	10	Map extent operations
	`osdop_sparse_read`	10	Sparse read operations
	`osdop_clonerange`	10	Clone range operations
	`osdop_getxattr`	10	Get xattr operations
	`osdop_setxattr`	10	Set xattr operations
	`osdop_cmpxattr`	10	Xattr comparison operations
	`osdop_rmxattr`	10	Remove xattr operations
	`osdop_resetxattrs`	10	Reset xattr operations
	`osdop_tmap_up`	10	TMAP update operations
	`osdop_tmap_put`	10	TMAP put operations
	`osdop_tmap_get`	10	TMAP get operations
	`osdop_call`	10	Call (execute) operations
	`osdop_watch`	10	Watch by object operations
	`osdop_notify`	10	Notify about object operations
	`osdop_src_cmpxattr`	10	Extended attribute comparison in multi operations
	`osdop_other`	10	Other operations
	`linger_active`	2	Active lingering operations
	`linger_send`	10	Sent lingering operations
	`linger_resend`	10	Resent lingering operations
	`linger_ping`	10	Sent pings to lingering operations
	`poolop_active`	2	Active pool operations
	`poolop_send`	10	Sent pool operations
	`poolop_resend`	10	Resent pool operations
	`poolstat_active`	2	Active get pool stat operations
	`poolstat_send`	10	Pool stat operations sent
	`poolstat_resend`	10	Resent pool stats
	`statfs_active`	2	Statfs operations
	`statfs_send`	10	Sent FS stats
	`statfs_resend`	10	Resent FS stats
	`command_active`	2	Active commands
	`command_send`	10	Sent commands
	`command_resend`	10	Resent commands
	`map_epoch`	2	OSD map epoch
	`map_full`	10	Full OSD maps received
	`map_inc`	10	Incremental OSD maps received
	`osd_sessions`	2	Open sessions
	`osd_session_open`	10	Sessions opened
	`osd_session_close`	10	Sessions closed
	`osd_laggy`	2	Laggy OSD sessions

Table 10.10. Read and Write Operations Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`osd`	`op_wip`	2	Replication operations currently being processed (primary)
	`op_in_bytes`	10	Client operations total write size
	`op_out_bytes`	10	Client operations total read size
	`op_latency`	5	Latency of client operations (including queue time)
	`op_process_latency`	5	Latency of client operations (excluding queue time)
	`op_r`	10	Client read operations
	`op_r_out_bytes`	10	Client data read
	`op_r_latency`	5	Latency of read operation (including queue time)
	`op_r_process_latency`	5	Latency of read operation (excluding queue time)
	`op_w`	10	Client write operations
	`op_w_in_bytes`	10	Client data written
	`op_w_rlat`	5	Client write operation readable/applied latency
	`op_w_latency`	5	Latency of write operation (including queue time)
	`op_w_process_latency`	5	Latency of write operation (excluding queue time)
	`op_rw`	10	Client read-modify-write operations
	`op_rw_in_bytes`	10	Client read-modify-write operations write in
	`op_rw_out_bytes`	10	Client read-modify-write operations read out
	`op_rw_rlat`	5	Client read-modify-write operation readable/applied latency
	`op_rw_latency`	5	Latency of read-modify-write operation (including queue time)
	`op_rw_process_latency`	5	Latency of read-modify-write operation (excluding queue time)
	`subop`	10	Suboperations
	`subop_in_bytes`	10	Suboperations total size
	`subop_latency`	5	Suboperations latency
	`subop_w`	10	Replicated writes
	`subop_w_in_bytes`	10	Replicated written data size
	`subop_w_latency`	5	Replicated writes latency
	`subop_pull`	10	Suboperations pull requests
	`subop_pull_latency`	5	Suboperations pull latency
	`subop_push`	10	Suboperations push messages
	`subop_push_in_bytes`	10	Suboperations pushed size
	`subop_push_latency`	5	Suboperations push latency
	`pull`	10	Pull requests sent
	`push`	10	Push messages sent
	`push_out_bytes`	10	Pushed size
	`push_in`	10	Inbound push messages
	`push_in_bytes`	10	Inbound pushed size
	`recovery_ops`	10	Started recovery operations
	`loadavg`	2	CPU load
	`buffer_bytes`	2	Total allocated buffer size
	`numpg`	2	Placement groups
	`numpg_primary`	2	Placement groups for which this osd is primary
	`numpg_replica`	2	Placement groups for which this osd is replica
	`numpg_stray`	2	Placement groups ready to be deleted from this osd
	`heartbeat_to_peers`	2	Heartbeat (ping) peers we send to
	`heartbeat_from_peers`	2	Heartbeat (ping) peers we recv from
	`map_messages`	10	OSD map messages
	`map_message_epochs`	10	OSD map epochs
	`map_message_epoch_dups`	10	OSD map duplicates
	`stat_bytes`	2	OSD size
	`stat_bytes_used`	2	Used space
	`stat_bytes_avail`	2	Available space
	`copyfrom`	10	Rados 'copy-from' operations
	`tier_promote`	10	Tier promotions
	`tier_flush`	10	Tier flushes
	`tier_flush_fail`	10	Failed tier flushes
	`tier_try_flush`	10	Tier flush attempts
	`tier_try_flush_fail`	10	Failed tier flush attempts
	`tier_evict`	10	Tier evictions
	`tier_whiteout`	10	Tier whiteouts
	`tier_dirty`	10	Dirty tier flag set
	`tier_clean`	10	Dirty tier flag cleaned
	`tier_delay`	10	Tier delays (agent waiting)
	`tier_proxy_read`	10	Tier proxy reads
	`agent_wake`	10	Tiering agent wake up
	`agent_skip`	10	Objects skipped by agent
	`agent_flush`	10	Tiering agent flushes
	`agent_evict`	10	Tiering agent evictions
	`object_ctx_cache_hit`	10	Object context cache hits
	`object_ctx_cache_total`	10	Object context cache lookups
	`ceph_cluster_osd_blocklist_count`	2	Number of clients blocklisted

Table 10.11. Recovery State Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`recoverystate_perf`	`initial_latency`	5	Initial recovery state latency
	`started_latency`	5	Started recovery state latency
	`reset_latency`	5	Reset recovery state latency
	`start_latency`	5	Start recovery state latency
	`primary_latency`	5	Primary recovery state latency
	`peering_latency`	5	Peering recovery state latency
	`backfilling_latency`	5	Backfilling recovery state latency
	`waitremotebackfillreserved_latency`	5	Wait remote backfill reserved recovery state latency
	`waitlocalbackfillreserved_latency`	5	Wait local backfill reserved recovery state latency
	`notbackfilling_latency`	5	Notbackfilling recovery state latency
	`repnotrecovering_latency`	5	Repnotrecovering recovery state latency
	`repwaitrecoveryreserved_latency`	5	Rep wait recovery reserved recovery state latency
	`repwaitbackfillreserved_latency`	5	Rep wait backfill reserved recovery state latency
	`RepRecovering_latency`	5	RepRecovering recovery state latency
	`activating_latency`	5	Activating recovery state latency
	`waitlocalrecoveryreserved_latency`	5	Wait local recovery reserved recovery state latency
	`waitremoterecoveryreserved_latency`	5	Wait remote recovery reserved recovery state latency
	`recovering_latency`	5	Recovering recovery state latency
	`recovered_latency`	5	Recovered recovery state latency
	`clean_latency`	5	Clean recovery state latency
	`active_latency`	5	Active recovery state latency
	`replicaactive_latency`	5	Replicaactive recovery state latency
	`stray_latency`	5	Stray recovery state latency
	`getinfo_latency`	5	Getinfo recovery state latency
	`getlog_latency`	5	Getlog recovery state latency
	`waitactingchange_latency`	5	Waitactingchange recovery state latency
	`incomplete_latency`	5	Incomplete recovery state latency
	`getmissing_latency`	5	Getmissing recovery state latency
	`waitupthru_latency`	5	Waitupthru recovery state latency

Table 10.12. OSD Throttle Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`throttle-*`	`val`	10	Currently available throttle
	`max`	10	Max value for throttle
	`get`	10	Gets
	`get_sum`	10	Got data
	`get_or_fail_fail`	10	Get blocked during get_or_fail
	`get_or_fail_success`	10	Successful get during get_or_fail
	`take`	10	Takes
	`take_sum`	10	Taken data
	`put`	10	Puts
	`put_sum`	10	Put data
	`wait`	5	Waiting latency

10.7. Ceph Object Gateway metrics

Table 10.13. Ceph Object Gateway Client Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`client.rgw.<rgw_node_name>`	`req`	10	Requests
	`failed_req`	10	Aborted requests
	`copy_obj_ops`	10	Copy objects
	`copy_obj_bytes`	10	Size of copy objects
	`copy_obj_lat`	10	Copy object latency
	`del_obj_ops`	10	Delete objects
	`del_obj_bytes`	10	Size of delete objects
	`del_obj_lat`	10	Delete object latency
	`del_bucket_ops`	10	Delete Buckets
	`del_bucket_lat`	10	Delete bucket latency
	`get`	10	Gets
	`get_b`	10	Size of gets
	`get_initial_lat`	5	Get latency
	`list_obj_ops`	10	List objects
	`list_obj_lat`	10	List object latency
	`list_buckets_ops`	10	List buckets
	`list_buckets_lat`	10	List buckets latency
	`put`	10	Puts
	`put_b`	10	Size of puts
	`put_initial_lat`	5	Put latency
	`qlen`	2	Queue length
	`qactive`	2	Active requests queue
	`cache_hit`	10	Cache hits
	`cache_miss`	10	Cache miss
	`keystone_token_cache_hit`	10	Keystone token cache hits
	`keystone_token_cache_miss`	10	Keystone token cache miss

Table 10.14. Objecter Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`objecter`	`op_active`	2	Active operations
	`op_laggy`	2	Laggy operations
	`op_send`	10	Sent operations
	`op_send_bytes`	10	Sent data
	`op_resend`	10	Resent operations
	`op_ack`	10	Commit callbacks
	`op_commit`	10	Operation commits
	`op`	10	Operation
	`op_r`	10	Read operations
	`op_w`	10	Write operations
	`op_rmw`	10	Read-modify-write operations
	`op_pg`	10	PG operation
	`osdop_stat`	10	Stat operations
	`osdop_create`	10	Create object operations
	`osdop_read`	10	Read operations
	`osdop_write`	10	Write operations
	`osdop_writefull`	10	Write full object operations
	`osdop_append`	10	Append operation
	`osdop_zero`	10	Set object to zero operations
	`osdop_truncate`	10	Truncate object operations
	`osdop_delete`	10	Delete object operations
	`osdop_mapext`	10	Map extent operations
	`osdop_sparse_read`	10	Sparse read operations
	`osdop_clonerange`	10	Clone range operations
	`osdop_getxattr`	10	Get xattr operations
	`osdop_setxattr`	10	Set xattr operations
	`osdop_cmpxattr`	10	Xattr comparison operations
	`osdop_rmxattr`	10	Remove xattr operations
	`osdop_resetxattrs`	10	Reset xattr operations
	`osdop_tmap_up`	10	TMAP update operations
	`osdop_tmap_put`	10	TMAP put operations
	`osdop_tmap_get`	10	TMAP get operations
	`osdop_call`	10	Call (execute) operations
	`osdop_watch`	10	Watch by object operations
	`osdop_notify`	10	Notify about object operations
	`osdop_src_cmpxattr`	10	Extended attribute comparison in multi operations
	`osdop_other`	10	Other operations
	`linger_active`	2	Active lingering operations
	`linger_send`	10	Sent lingering operations
	`linger_resend`	10	Resent lingering operations
	`linger_ping`	10	Sent pings to lingering operations
	`poolop_active`	2	Active pool operations
	`poolop_send`	10	Sent pool operations
	`poolop_resend`	10	Resent pool operations
	`poolstat_active`	2	Active get pool stat operations
	`poolstat_send`	10	Pool stat operations sent
	`poolstat_resend`	10	Resent pool stats
	`statfs_active`	2	Statfs operations
	`statfs_send`	10	Sent FS stats
	`statfs_resend`	10	Resent FS stats
	`command_active`	2	Active commands
	`command_send`	10	Sent commands
	`command_resend`	10	Resent commands
	`map_epoch`	2	OSD map epoch
	`map_full`	10	Full OSD maps received
	`map_inc`	10	Incremental OSD maps received
	`osd_sessions`	2	Open sessions
	`osd_session_open`	10	Sessions opened
	`osd_session_close`	10	Sessions closed
	`osd_laggy`	2	Laggy OSD sessions

Table 10.15. Ceph Object Gateway Throttle Metrics Table
Collection Name	Metric Name	Bit Field Value	Short Description
`throttle-*`	`val`	10	Currently available throttle
	`max`	10	Max value for throttle
	`get`	10	Gets
	`get_sum`	10	Got data
	`get_or_fail_fail`	10	Get blocked during get_or_fail
	`get_or_fail_success`	10	Successful get during get_or_fail
	`take`	10	Takes
	`take_sum`	10	Taken data
	`put`	10	Puts
	`put_sum`	10	Put data
	`wait`	5	Waiting latency

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10.1. Access to Ceph performance counters

10.2. Display the Ceph performance counters

10.3. Dump the Ceph performance counters

10.4. Average count and sum

10.5. Ceph Monitor metrics

10.6. Ceph OSD metrics

10.7. Ceph Object Gateway metrics

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