Chapter 9. Ceph performance counters As a storage administrator, you can gather performance metrics of the Red Hat Ceph Storage cluster. The Ceph performance counters are a collection of internal infrastructure metrics. The collection, aggregation, and graphing of this metric data can be done by an assortment of tools and can be useful for performance analytics. 9.1. 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 9.2. 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 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 Executing the ceph daemon DAEMON_NAME perf schema command from the OSD node: Example Table 9.1. 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 interval would be the sum delta, since the 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. 9.3. 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 Note You must run the ceph daemon command from the node running the daemon. Executing ceph daemon .. perf dump command from the Monitor node: Executing the ceph daemon .. perf dump command from the OSD node: Additional Resources To view a short description of each Monitor metric available, please see the Ceph monitor metrics table . 9.4. 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 . 9.5. Ceph Monitor metrics Cluster Metrics Table Level Database Metrics Table General Monitor Metrics Table Paxos Metrics Table Throttle Metrics Table Table 9.2. 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 9.3. 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 9.4. 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 9.5. 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 9.6. 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 9.6. Ceph OSD metrics Write Back Throttle Metrics Table Level Database Metrics Table Objecter Metrics Table Read and Write Operations Metrics Table Recovery State Metrics Table OSD Throttle Metrics Table Table 9.7. 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 9.8. 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 9.9. 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 9.10. 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 9.11. 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 9.12. 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 9.7. Ceph Object Gateway metrics Ceph Object Gateway Client Table Objecter Metrics Table Ceph Object Gateway Throttle Metrics Table Table 9.13. 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 get 10 Gets get_b 10 Size of gets get_initial_lat 5 Get 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 9.14. 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 9.15. 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

Commands:
ceph daemon DAEMON_NAME perf schema
ceph daemon mon.host01 perf schema
ceph daemon osd.11 perf schema
ceph daemon DAEMON_NAME perf dump
ceph daemon mon.host01 perf dump
ceph daemon osd.11 perf dump