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=",
"bluestore_rocksdb_options": "compression=kNoCompression,max_write_buffer_number=4,min_write_buffer_number_to_merge=1,recycle_log_file_num=4,write_buffer_size=268435456,writable_file_max_buffer_size=0,compaction_readahead_size=2097152",
"bluestore_spdk_coremask": "0x1",
"bluestore_spdk_io_sleep": "5",
"bluestore_spdk_max_io_completion": "0",
"bluestore_spdk_mem": "512",
"bluestore_sync_submit_transaction": "false",
"bluestore_throttle_bytes": "67108864",
"bluestore_throttle_cost_per_io": "0",
"bluestore_throttle_cost_per_io_hdd": "670000",
"bluestore_throttle_cost_per_io_ssd": "4000",
"bluestore_throttle_deferred_bytes": "134217728",
"bluestore_warn_on_bluefs_spillover": "true",
"bluestore_warn_on_legacy_statfs": "true",
"cephx_cluster_require_signatures": "false",
"cephx_cluster_require_version": "1",
"cephx_require_signatures": "false",
"cephx_require_version": "1",
"cephx_service_require_signatures": "false",
"cephx_service_require_version": "1",
"cephx_sign_messages": "true",
"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_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": "false",
"debug_asserts_on_shutdown": "false",
"debug_auth": "1/5",
"debug_bdev": "1/3",
"debug_bluefs": "1/5",
"debug_bluestore": "1/5",
"debug_buffer": "0/1",
"debug_civetweb": "1/10",
"debug_client": "0/5",
"debug_compressor": "1/5",
"debug_context": "0/1",
"debug_crush": "1/1",
"debug_crypto": "1/5",
"debug_deliberately_leak_memory": "false",
"debug_dpdk": "1/5",
"debug_eventtrace": "1/5",
"debug_filer": "0/1",
"debug_filestore": "1/3",
"debug_finisher": "1/1",
"debug_fuse": "1/5",
"debug_heartbeatmap": "1/5",
"debug_javaclient": "1/5",
"debug_journal": "1/3",
"debug_journaler": "0/5",
"debug_kinetic": "1/5",
"debug_kstore": "1/5",
"debug_leveldb": "4/5",
"debug_lockdep": "0/1",
"debug_mds": "1/5",
"debug_mds_balancer": "1/5",
"debug_mds_locker": "1/5",
"debug_mds_log": "1/5",
"debug_mds_log_expire": "1/5",
"debug_mds_migrator": "1/5",
"debug_memdb": "4/5",
"debug_mgr": "1/5",
"debug_mgrc": "1/5",
"debug_mon": "1/5",
"debug_monc": "0/10",
"debug_ms": "0/0",
"debug_none": "0/5",
"debug_objclass": "0/5",
"debug_objectcacher": "0/5",
"debug_objecter": "0/1",
"debug_optracker": "0/5",
"debug_osd": "1/5",
"debug_paxos": "1/5",
"debug_perfcounter": "1/5",
"debug_rados": "0/5",
"debug_rbd": "0/5",
"debug_rbd_mirror": "0/5",
"debug_rbd_replay": "0/5",
"debug_refs": "0/0",
"debug_reserver": "1/1",
"debug_rgw": "1/5",
"debug_rgw_sync": "1/5",
"debug_rocksdb": "4/5",
"debug_striper": "0/1",
"debug_throttle": "1/1",
"debug_timer": "0/1",
"debug_tp": "0/5",
"debug_xio": "1/5",
"device_failure_prediction_mode": "none",
"enable_experimental_unrecoverable_data_corrupting_features": "",
"erasure_code_dir": "/usr/lib/ceph/erasure-code",
"err_to_graylog": "false",
"err_to_stderr": "true",
"err_to_syslog": "false",
"event_tracing": "false",
"fake_statfs_for_testing": "0",
"fatal_signal_handlers": "true",
"filer_max_purge_ops": "10",
"filer_max_truncate_ops": "128",
"filestore_apply_finisher_threads": "1",
"filestore_blackhole": "false",
"filestore_btrfs_clone_range": "true",
"filestore_btrfs_snap": "true",
"filestore_caller_concurrency": "10",
"filestore_collect_device_partition_information": "true",
"filestore_commit_timeout": "600.000000",
"filestore_debug_inject_read_err": "false",
"filestore_debug_omap_check": "false",
"filestore_debug_random_read_err": "0.000000",
"filestore_debug_verify_split": "false",
"filestore_dump_file": "",
"filestore_expected_throughput_bytes": "209715200.000000",
"filestore_expected_throughput_ops": "200.000000",
"filestore_fadvise": "true",
"filestore_fail_eio": "true",
"filestore_fd_cache_shards": "16",
"filestore_fd_cache_size": "128",
"filestore_fiemap": "false",
"filestore_fiemap_threshold": "4096",
"filestore_fsync_flushes_journal_data": "false",
"filestore_index_retry_probability": "0.000000",
"filestore_inject_stall": "0",
"filestore_journal_parallel": "false",
"filestore_journal_trailing": "false",
"filestore_journal_writeahead": "false",
"filestore_kill_at": "0",
"filestore_max_alloc_hint_size": "1048576",
"filestore_max_inline_xattr_size": "0",
"filestore_max_inline_xattr_size_btrfs": "2048",
"filestore_max_inline_xattr_size_other": "512",
"filestore_max_inline_xattr_size_xfs": "65536",
"filestore_max_inline_xattrs": "0",
"filestore_max_inline_xattrs_btrfs": "10",
"filestore_max_inline_xattrs_other": "2",
"filestore_max_inline_xattrs_xfs": "10",
"filestore_max_sync_interval": "5.000000",
"filestore_max_xattr_value_size": "0",
"filestore_max_xattr_value_size_btrfs": "65536",
"filestore_max_xattr_value_size_other": "1024",
"filestore_max_xattr_value_size_xfs": "65536",
"filestore_merge_threshold": "-10",
"filestore_min_sync_interval": "0.010000",
"filestore_odsync_write": "false",
"filestore_omap_backend": "rocksdb",
"filestore_omap_backend_path": "",
"filestore_omap_header_cache_size": "1024",
"filestore_ondisk_finisher_threads": "1",
"filestore_op_thread_suicide_timeout": "180",
"filestore_op_thread_timeout": "60",
"filestore_op_threads": "2",
"filestore_punch_hole": "false",
"filestore_queue_high_delay_multiple": "0.000000",
"filestore_queue_high_delay_multiple_bytes": "0.000000",
"filestore_queue_high_delay_multiple_ops": "0.000000",
"filestore_queue_high_threshhold": "0.900000",
"filestore_queue_low_threshhold": "0.300000",
"filestore_queue_max_bytes": "104857600",
"filestore_queue_max_delay_multiple": "0.000000",
"filestore_queue_max_delay_multiple_bytes": "0.000000",
"filestore_queue_max_delay_multiple_ops": "0.000000",
"filestore_queue_max_ops": "50",
"filestore_rocksdb_options": "max_background_jobs=10,compaction_readahead_size=2097152,compression=kNoCompression",
"filestore_seek_data_hole": "false",
"filestore_sloppy_crc": "false",
"filestore_sloppy_crc_block_size": "65536",
"filestore_splice": "false",
"filestore_split_multiple": "2",
"filestore_split_rand_factor": "20",
"filestore_update_to": "1000",
"filestore_wbthrottle_btrfs_bytes_hard_limit": "419430400",
"filestore_wbthrottle_btrfs_bytes_start_flusher": "41943040",
"filestore_wbthrottle_btrfs_inodes_hard_limit": "5000",
"filestore_wbthrottle_btrfs_inodes_start_flusher": "500",
"filestore_wbthrottle_btrfs_ios_hard_limit": "5000",
"filestore_wbthrottle_btrfs_ios_start_flusher": "500",
"filestore_wbthrottle_enable": "true",
"filestore_wbthrottle_xfs_bytes_hard_limit": "419430400",
"filestore_wbthrottle_xfs_bytes_start_flusher": "41943040",
"filestore_wbthrottle_xfs_inodes_hard_limit": "5000",
"filestore_wbthrottle_xfs_inodes_start_flusher": "500",
"filestore_wbthrottle_xfs_ios_hard_limit": "5000",
"filestore_wbthrottle_xfs_ios_start_flusher": "500",
"filestore_xfs_extsize": "false",
"filestore_zfs_snap": "false",
"fio_dir": "/tmp/fio",
"fsid": "fdf6eba0-cde9-401c-8901-751eb1e8b7d2",
"fuse_allow_other": "true",
"fuse_atomic_o_trunc": "true",
"fuse_big_writes": "false",
"fuse_debug": "false",
"fuse_default_permissions": "false",
"fuse_disable_pagecache": "false",
"fuse_max_write": "0",
"fuse_multithreaded": "true",
"fuse_require_active_mds": "true",
"fuse_set_user_groups": "true",
"fuse_syncfs_on_mksnap": "true",
"fuse_use_invalidate_cb": "true",
"gss_ktab_client_file": "/var/lib/ceph/mon.sbg2-k8s001/gss_client_mon.sbg2-k8s001.ktab",
"gss_target_name": "ceph",
"heartbeat_file": "",
"heartbeat_inject_failure": "0",
"heartbeat_interval": "5",
"host": "",
"inject_early_sigterm": "false",
"journal_aio": "true",
"journal_align_min_size": "65536",
"journal_block_align": "true",
"journal_block_size": "4096",
"journal_dio": "true",
"journal_discard": "false",
"journal_force_aio": "false",
"journal_ignore_corruption": "false",
"journal_max_write_bytes": "1073714824",
"journal_max_write_entries": "10000",
"journal_replay_from": "0",
"journal_throttle_high_multiple": "0.000000",
"journal_throttle_high_threshhold": "0.900000",
"journal_throttle_low_threshhold": "0.600000",
"journal_throttle_max_multiple": "0.000000",
"journal_write_header_frequency": "0",
"journal_zero_on_create": "false",
"journaler_prefetch_periods": "10",
"journaler_prezero_periods": "5",
"journaler_write_head_interval": "15",
"key": "",
"keyfile": "",
"keyring": "/var/lib/ceph/mon/ceph-sbg2-k8s001/keyring",
"kinetic_hmac_key": "asdfasdf",
"kinetic_host": "",
"kinetic_port": "8123",
"kinetic_use_ssl": "false",
"kinetic_user_id": "1",
"kstore_backend": "rocksdb",
"kstore_default_stripe_size": "65536",
"kstore_fsck_on_mount": "false",
"kstore_fsck_on_mount_deep": "true",
"kstore_max_bytes": "67108864",
"kstore_max_ops": "512",
"kstore_nid_prealloc": "1024",
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"pid_file": "",
"plugin_crypto_accelerator": "crypto_isal",
"plugin_dir": "/usr/lib/ceph",
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"rgw_keystone_accepted_roles": "Member, admin",
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"rgw_keystone_admin_project": "",
"rgw_keystone_admin_tenant": "",
"rgw_keystone_admin_token": "",
"rgw_keystone_admin_token_path": "",
"rgw_keystone_admin_user": "",
"rgw_keystone_api_version": "2",
"rgw_keystone_barbican_domain": "",
"rgw_keystone_barbican_password": "",
"rgw_keystone_barbican_project": "",
"rgw_keystone_barbican_tenant": "",
"rgw_keystone_barbican_user": "",
"rgw_keystone_implicit_tenants": "false",
"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",
"rg