hello I got a huge difference of read/write performance on my ceph cluster when I use rbd. rbd bench reach the limit of my cluster (1gbps network) when the performance in mapped rbd is very low. 30MB/s. ceph version : ceph version 14.2.2 (4f8fa0a0024755aae7d95567c63f11d6862d55be) nautilus (stable) kernel version : 4.19.0-5-amd64 ceph -s cluster: id: fdf6eba0-cde9-401c-8901-751eb1e8b7d2 health: HEALTH_OK services: mon: 3 daemons, quorum gra3-k8s001,sbg2-k8s001,rbx4-k8s001 (age 41h) mgr: sbg2-k8s001(active, since 46h), standbys: gra3-k8s001, rbx4-k8s001 osd: 10 osds: 10 up (since 41h), 10 in (since 41h) rgw: 3 daemons active (gra3-k8s001, rbx4-k8s001, sbg2-k8s001) data: pools: 8 pools, 240 pgs objects: 109.14k objects, 229 GiB usage: 694 GiB used, 3.0 TiB / 3.7 TiB avail pgs: 240 active+clean here the bench rbd create --size=10G kube/bench rbd feature disable kube/bench object-map fast-diff deep-flatten rbd -p kube bench kube/bench --io-type write --io-size 8192 --io-threads 256 --io-total 10G --io-pattern seq elapsed: 110 ops: 1310720 ops/sec: 11884.39 bytes/sec: 97356926.64 this reach the 1gbps limit of my network. Looks good. let's test random write rbd -p kube bench kube/bench --io-type write --io-size 8192 --io-threads 256 --io-total 10G --io-pattern rand elapsed: 125 ops: 1310720 ops/sec: 10416.31 bytes/sec: 85330446.58 this reach the 1gbps limit of my network. Looks good. rbd -p kube bench kube/bench --io-type read --io-size 8192 --io-threads 256 --io-total 10G --io-pattern seq elapsed: 40 ops: 1310720 ops/sec: 32712.03 bytes/sec: 267976974.35 this is great perf ! let's try rand rbd -p kube bench kube/bench --io-type read --io-size 8192 --io-threads 256 --io-total 10G --io-pattern rand elapsed: 29 ops: 1310720 ops/sec: 43859.78 bytes/sec: 359299337.92 this is great perf ! But when I mount the image : rbd map bench --pool kube --name client.admin /sbin/mkfs.ext4 /dev/rbd/kube/bench mount /dev/rbd/kube/bench /mnt/ cd /mnt/ dd if=/dev/zero of=test bs=8192k count=100 oflag=direct 838860800 bytes (839 MB, 800 MiB) copied, 24.6185 s, 34.1 MB/s 34.1MB/s vs 85MB/s .... here the full config { "name": "mon.sbg2-k8s001", "cluster": "ceph", "admin_socket": "/var/run/ceph/ceph-mon.sbg2-k8s001.asok", "admin_socket_mode": "", "auth_client_required": "cephx", "auth_cluster_required": "cephx", "auth_debug": "false", "auth_mon_ticket_ttl": "43200.000000", "auth_service_required": "cephx", "auth_service_ticket_ttl": "3600.000000", "auth_supported": "", "bdev_aio": "true", "bdev_aio_max_queue_depth": "1024", "bdev_aio_poll_ms": "250", "bdev_aio_reap_max": "16", "bdev_async_discard": "false", "bdev_block_size": "4096", "bdev_debug_aio": "false", "bdev_debug_aio_log_age": "5.000000", "bdev_debug_aio_suicide_timeout": "60.000000", "bdev_debug_inflight_ios": "false", "bdev_enable_discard": "false", "bdev_inject_crash": "0", "bdev_inject_crash_flush_delay": "2", "bdev_nvme_retry_count": "-1", "bdev_nvme_unbind_from_kernel": "false", "bluefs_alloc_size": "1048576", "bluefs_allocator": "bitmap", "bluefs_buffered_io": "true", "bluefs_compact_log_sync": "false", "bluefs_log_compact_min_ratio": "5.000000", "bluefs_log_compact_min_size": "16777216", "bluefs_max_log_runway": "4194304", "bluefs_max_prefetch": "1048576", "bluefs_min_flush_size": "524288", "bluefs_min_log_runway": "1048576", "bluefs_preextend_wal_files": "false", "bluefs_sync_write": "false", "bluestore_2q_cache_kin_ratio": "0.500000", "bluestore_2q_cache_kout_ratio": "0.500000", "bluestore_allocator": "bitmap", "bluestore_bitmapallocator_blocks_per_zone": "1024", "bluestore_bitmapallocator_span_size": "1024", "bluestore_blobid_prealloc": "10240", "bluestore_block_create": "true", "bluestore_block_db_create": "false", "bluestore_block_db_path": "", "bluestore_block_db_size": "0", "bluestore_block_path": "", "bluestore_block_preallocate_file": "false", "bluestore_block_size": "10737418240", "bluestore_block_wal_create": "false", "bluestore_block_wal_path": "", "bluestore_block_wal_size": "100663296", "bluestore_bluefs": "true", "bluestore_bluefs_alloc_failure_dump_interval": "0.000000", "bluestore_bluefs_balance_interval": "1.000000", "bluestore_bluefs_db_compatibility": "true", "bluestore_bluefs_env_mirror": "false", "bluestore_bluefs_gift_ratio": "0.020000", "bluestore_bluefs_max_ratio": "0.900000", "bluestore_bluefs_min": "1073741824", "bluestore_bluefs_min_free": "1073741824", "bluestore_bluefs_min_ratio": "0.020000", "bluestore_bluefs_reclaim_ratio": "0.200000", "bluestore_cache_autotune": "true", "bluestore_cache_autotune_interval": "5.000000", "bluestore_cache_kv_ratio": "0.400000", "bluestore_cache_meta_ratio": "0.400000", "bluestore_cache_size": "0", "bluestore_cache_size_hdd": "1073741824", "bluestore_cache_size_ssd": "3221225472", "bluestore_cache_trim_interval": "0.050000", "bluestore_cache_trim_max_skip_pinned": "64", "bluestore_cache_type": "2q", "bluestore_clone_cow": "true", "bluestore_compression_algorithm": "snappy", "bluestore_compression_max_blob_size": "0", "bluestore_compression_max_blob_size_hdd": "524288", "bluestore_compression_max_blob_size_ssd": "65536", "bluestore_compression_min_blob_size": "0", "bluestore_compression_min_blob_size_hdd": "131072", "bluestore_compression_min_blob_size_ssd": "8192", "bluestore_compression_mode": "none", "bluestore_compression_required_ratio": "0.875000", "bluestore_csum_type": "crc32c", "bluestore_debug_freelist": "false", "bluestore_debug_fsck_abort": "false", "bluestore_debug_inject_bug21040": "false", "bluestore_debug_inject_csum_err_probability": "0.000000", "bluestore_debug_inject_read_err": "false", "bluestore_debug_misc": "false", "bluestore_debug_no_reuse_blocks": "false", "bluestore_debug_omit_block_device_write": "false", "bluestore_debug_omit_kv_commit": "false", "bluestore_debug_permit_any_bdev_label": "false", "bluestore_debug_prefill": "0.000000", "bluestore_debug_prefragment_max": "1048576", "bluestore_debug_random_read_err": "0.000000", "bluestore_debug_randomize_serial_transaction": "0", "bluestore_debug_small_allocations": "0", "bluestore_default_buffered_read": "true", "bluestore_default_buffered_write": "false", "bluestore_deferred_batch_ops": "0", "bluestore_deferred_batch_ops_hdd": "64", "bluestore_deferred_batch_ops_ssd": "16", "bluestore_extent_map_inline_shard_prealloc_size": "256", "bluestore_extent_map_shard_max_size": "1200", "bluestore_extent_map_shard_min_size": "150", "bluestore_extent_map_shard_target_size": "500", "bluestore_extent_map_shard_target_size_slop": "0.200000", "bluestore_freelist_blocks_per_key": "128", "bluestore_fsck_on_mkfs": "true", "bluestore_fsck_on_mkfs_deep": "false", "bluestore_fsck_on_mount": "false", "bluestore_fsck_on_mount_deep": "true", "bluestore_fsck_on_umount": "false", "bluestore_fsck_on_umount_deep": "true", "bluestore_fsck_read_bytes_cap": "67108864", "bluestore_gc_enable_blob_threshold": "0", "bluestore_gc_enable_total_threshold": "0", "bluestore_ignore_data_csum": "false", "bluestore_kvbackend": "rocksdb", "bluestore_log_omap_iterator_age": "1.000000", "bluestore_log_op_age": "5.000000", "bluestore_max_alloc_size": "0", "bluestore_max_blob_size": "0", "bluestore_max_blob_size_hdd": "524288", "bluestore_max_blob_size_ssd": "65536", "bluestore_max_deferred_txc": "32", "bluestore_min_alloc_size": "0", "bluestore_min_alloc_size_hdd": "65536", "bluestore_min_alloc_size_ssd": "16384", "bluestore_nid_prealloc": "1024", "bluestore_no_per_pool_stats_tolerance": "until_repair", "bluestore_prefer_deferred_size": "0", "bluestore_prefer_deferred_size_hdd": "32768", "bluestore_prefer_deferred_size_ssd": "0", "bluestore_retry_disk_reads": "3", "bluestore_rocksdb_cf": "false", "bluestore_rocksdb_cfs": "M= P= L=", 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"chdir": "", "client_acl_type": "", "client_cache_mid": "0.750000", "client_cache_size": "16384", "client_caps_release_delay": "5", "client_check_pool_perm": "true", "client_debug_force_sync_read": "false", "client_debug_getattr_caps": "false", "client_debug_inject_tick_delay": "0", "client_die_on_failed_dentry_invalidate": "true", "client_die_on_failed_remount": "false", "client_dirsize_rbytes": "true", "client_force_lazyio": "false", "client_inject_fixed_oldest_tid": "false", "client_inject_release_failure": "false", "client_max_inline_size": "4096", "client_mds_namespace": "", "client_metadata": "", "client_mount_gid": "-1", "client_mount_timeout": "300.000000", "client_mount_uid": "-1", "client_mountpoint": "/", "client_notify_timeout": "10", "client_oc": "true", "client_oc_max_dirty": "104857600", "client_oc_max_dirty_age": "5.000000", "client_oc_max_objects": "1000", "client_oc_size": "209715200", "client_oc_target_dirty": "8388608", "client_permissions": "true", "client_quota_df": "true", "client_readahead_max_bytes": "0", "client_readahead_max_periods": "4", "client_readahead_min": "131072", "client_reconnect_stale": "false", "client_snapdir": ".snap", "client_tick_interval": "1.000000", "client_trace": "", "client_try_dentry_invalidate": "false", "client_use_faked_inos": "false", "client_use_random_mds": "false", "clog_to_graylog": "false", "clog_to_graylog_host": "127.0.0.1", "clog_to_graylog_port": "12201", "clog_to_monitors": "default=true", "clog_to_syslog": "false", "clog_to_syslog_facility": "default=daemon audit=local0", "clog_to_syslog_level": "info", "cluster_addr": "-", "cluster_network": "192.168.212.0/24", "cluster_network_interface": "", "compressor_zlib_isal": "false", "compressor_zlib_level": "5", "crash_dir": "/var/lib/ceph/crash", "crush_location": "", "crush_location_hook": "", "crush_location_hook_timeout": "10", "daemonize": "false", "debug_allow_any_pool_priority": "false", "debug_asok": "1/5", "debug_asok_assert_abort": 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"rgw_keystone_revocation_interval": "900", "rgw_keystone_token_cache_size": "10000", "rgw_keystone_url": "", "rgw_keystone_verify_ssl": "true", "rgw_lc_debug_interval": "-1", "rgw_lc_lock_max_time": "60", "rgw_lc_max_objs": "32", "rgw_lc_max_rules": "1000", "rgw_lc_thread_delay": "0", "rgw_ldap_binddn": "uid=admin,cn=users,dc=example,dc=com", "rgw_ldap_dnattr": "uid", "rgw_ldap_searchdn": "cn=users,cn=accounts,dc=example,dc=com", "rgw_ldap_searchfilter": "", "rgw_ldap_secret": "/etc/openldap/secret", "rgw_ldap_uri": "ldaps://<ldap.your.domain>", "rgw_lifecycle_work_time": "00:00-06:00", "rgw_list_bucket_min_readahead": "1000", "rgw_list_buckets_max_chunk": "1000", "rgw_log_http_headers": "", "rgw_log_nonexistent_bucket": "false", "rgw_log_object_name": "%Y-%m-%d-%H-%i-%n", "rgw_log_object_name_utc": "false", "rgw_max_attr_name_len": "0", "rgw_max_attr_size": "0", "rgw_max_attrs_num_in_req": "0", "rgw_max_chunk_size": "4194304", "rgw_max_concurrent_requests": "1024", "rgw_max_listing_results": "1000", "rgw_max_notify_retries": "3", "rgw_max_objs_per_shard": "100000", "rgw_max_put_param_size": "1048576", "rgw_max_put_size": "5368709120", "rgw_max_slo_entries": "1000", "rgw_md_log_max_shards": "64", "rgw_md_notify_interval_msec": "200", "rgw_mime_types_file": "/etc/mime.types", "rgw_mp_lock_max_time": "600", "rgw_multipart_min_part_size": "5242880", "rgw_multipart_part_upload_limit": "10000", "rgw_nfs_fhcache_partitions": "3", "rgw_nfs_fhcache_size": "2017", "rgw_nfs_lru_lane_hiwat": "911", "rgw_nfs_lru_lanes": "5", "rgw_nfs_max_gc": "300", "rgw_nfs_namespace_expire_secs": "300", "rgw_nfs_write_completion_interval_s": "10", "rgw_num_async_rados_threads": "32", "rgw_num_control_oids": "8", "rgw_num_rados_handles": "1", "rgw_obj_stripe_size": "4194304", "rgw_obj_tombstone_cache_size": "1000", "rgw_objexp_chunk_size": "100", "rgw_objexp_gc_interval": "600", "rgw_objexp_hints_num_shards": "127", "rgw_olh_pending_timeout_sec": "3600", "rgw_op_thread_suicide_timeout": "0", "rgw_op_thread_timeout": "600", "rgw_op_tracing": "false", "rgw_opa_token": "", "rgw_opa_url": "", "rgw_opa_verify_ssl": "true", "rgw_ops_log_data_backlog": "5242880", "rgw_ops_log_rados": "true", "rgw_ops_log_socket_path": "", "rgw_override_bucket_index_max_shards": "0", "rgw_period_latest_epoch_info_oid": ".latest_epoch", "rgw_period_push_interval": "2.000000", "rgw_period_push_interval_max": "30.000000", "rgw_period_root_pool": ".rgw.root", "rgw_port": "", "rgw_print_continue": "true", "rgw_print_prohibited_content_length": "false", "rgw_put_obj_max_window_size": "67108864", "rgw_put_obj_min_window_size": "16777216", "rgw_rados_tracing": "false", "rgw_realm": "", "rgw_realm_root_pool": ".rgw.root", "rgw_region": "", "rgw_region_root_pool": ".rgw.root", "rgw_relaxed_region_enforcement": "false", "rgw_relaxed_s3_bucket_names": "false", "rgw_remote_addr_param": "REMOTE_ADDR", "rgw_request_uri": "", "rgw_reshard_batch_size": "64", "rgw_reshard_bucket_lock_duration": "360", "rgw_reshard_max_aio": "128", "rgw_reshard_num_logs": "16", "rgw_reshard_thread_interval": "600", "rgw_resolve_cname": "false", "rgw_rest_getusage_op_compat": "false", "rgw_run_sync_thread": "true", "rgw_s3_auth_order": "sts, external, local", "rgw_s3_auth_use_keystone": "false", "rgw_s3_auth_use_ldap": "false", "rgw_s3_auth_use_rados": "true", "rgw_s3_auth_use_sts": "false", "rgw_s3_success_create_obj_status": "0", "rgw_safe_max_objects_per_shard": "102400", "rgw_scheduler_type": "throttler", "rgw_script_uri": "", "rgw_service_provider_name": "", "rgw_shard_warning_threshold": "90.000000", "rgw_socket_path": "", "rgw_sts_client_id": "", "rgw_sts_client_secret": "", "rgw_sts_entry": "sts", "rgw_sts_key": "sts", "rgw_sts_max_session_duration": "43200", "rgw_sts_token_introspection_url": "", "rgw_swift_account_in_url": "false", "rgw_swift_auth_entry": "auth", "rgw_swift_auth_url": "", "rgw_swift_custom_header": "", "rgw_swift_enforce_content_length": "false", "rgw_swift_need_stats": "true", "rgw_swift_tenant_name": "", "rgw_swift_token_expiration": "86400", "rgw_swift_url": "", "rgw_swift_url_prefix": "swift", "rgw_swift_versioning_enabled": "false", "rgw_sync_data_inject_err_probability": "0.000000", "rgw_sync_lease_period": "120", "rgw_sync_log_trim_concurrent_buckets": "4", "rgw_sync_log_trim_interval": "1200", "rgw_sync_log_trim_max_buckets": "16", "rgw_sync_log_trim_min_cold_buckets": "4", "rgw_sync_meta_inject_err_probability": "0.000000", "rgw_sync_trace_history_size": "4096", "rgw_sync_trace_per_node_log_size": "32", "rgw_sync_trace_servicemap_update_interval": "10", "rgw_thread_pool_size": "512", "rgw_torrent_comment": "", "rgw_torrent_createby": "", "rgw_torrent_encoding": "", "rgw_torrent_flag": "false", "rgw_torrent_origin": "", "rgw_torrent_sha_unit": "524288", "rgw_torrent_tracker": "", "rgw_trust_forwarded_https": "false", "rgw_usage_log_flush_threshold": "1024", "rgw_usage_log_tick_interval": "30", "rgw_usage_max_shards": "32", "rgw_usage_max_user_shards": "1", "rgw_use_opa_authz": "false", "rgw_user_default_quota_max_objects": "-1", "rgw_user_default_quota_max_size": "-1", "rgw_user_max_buckets": "1000", "rgw_user_quota_bucket_sync_interval": "180", "rgw_user_quota_sync_idle_users": "false", "rgw_user_quota_sync_interval": "86400", "rgw_user_quota_sync_wait_time": "86400", "rgw_verify_ssl": "true", "rgw_website_routing_rules_max_num": "50", "rgw_zone": "", "rgw_zone_root_pool": ".rgw.root", "rgw_zonegroup": "", "rgw_zonegroup_root_pool": ".rgw.root", "rocksdb_block_size": "4096", "rocksdb_bloom_bits_per_key": "20", "rocksdb_cache_index_and_filter_blocks": "true", "rocksdb_cache_index_and_filter_blocks_with_high_priority": "true", "rocksdb_cache_row_ratio": "0.000000", "rocksdb_cache_shard_bits": "4", "rocksdb_cache_size": "536870912", "rocksdb_cache_type": "binned_lru", "rocksdb_collect_compaction_stats": "false", "rocksdb_collect_extended_stats": "false", "rocksdb_collect_memory_stats": "false", "rocksdb_enable_rmrange": "false", "rocksdb_index_type": "binary_search", "rocksdb_log_to_ceph_log": "true", "rocksdb_metadata_block_size": "4096", "rocksdb_partition_filters": "false", "rocksdb_perf": "false", "rocksdb_pin_l0_filter_and_index_blocks_in_cache": "true", "rotating_keys_bootstrap_timeout": "30", "rotating_keys_renewal_timeout": "10", "run_dir": "/var/run/ceph", "setgroup": "ceph", "setuser": "ceph", "setuser_match_path": "", "target_max_misplaced_ratio": "0.050000", "threadpool_default_timeout": "60", "threadpool_empty_queue_max_wait": "2", "throttler_perf_counter": "true", "xio_max_conns_per_portal": "32", "xio_max_send_inline": "512", "xio_mp_max_1k": "8192", "xio_mp_max_256": "8192", "xio_mp_max_64": "65536", "xio_mp_max_hint": "4096", "xio_mp_max_page": "4096", "xio_mp_min": "128", "xio_portal_threads": "2", "xio_queue_depth": "128", "xio_trace_mempool": "false", "xio_trace_msgcnt": "false", "xio_trace_xcon": "false", "xio_transport_type": "rdma" } |
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