ceph tell osd.5 perf dump -f json | jq '{bluefs, rocksdb}'
ceph tell osd.8 perf dump -f json | jq '{bluefs, rocksdb}'
journalctl -u ceph-osd@5 --since "2026-10-12" | grep -Ei 'bluefs|spillover|rocksdb|compact'
journalctl -u ceph-osd@8 --since "2026-10-12" | grep -Ei 'bluefs|spillover|rocksdb|compact'
{
"bluefs": {
"db_total_bytes": 75161919488,
"db_used_bytes": 13092519936,
"wal_total_bytes": 0,
"wal_used_bytes": 0,
"slow_total_bytes": 2000397795328,
"slow_used_bytes": 0,
"num_files": 253,
"log_bytes": 14913536,
"log_compactions": 2252,
"log_write_count": 8069720,
"logged_bytes": 33053573120,
"files_written_wal": 8739,
"files_written_sst": 1314,
"write_count_wal": 8055766,
"write_count_sst": 46818,
"bytes_written_wal": 176855584768,
"bytes_written_sst": 24571727872,
"bytes_written_slow": 0,
"max_bytes_wal": 0,
"max_bytes_db": 51437895680,
"max_bytes_slow": 0,
"alloc_unit_slow": 65536,
"alloc_unit_db": 1048576,
"alloc_unit_wal": 0,
"read_random_lat": {
"avgcount": 771481,
"sum": 16.723545462,
"avgtime": 2.1677e-05
},
"read_random_count": 771481,
"read_random_bytes": 26169882981,
"read_random_disk_count": 248946,
"read_random_disk_bytes": 24688731604,
"read_random_disk_bytes_wal": 0,
"read_random_disk_bytes_db": 24550952043,
"read_random_disk_bytes_slow": 137779561,
"read_random_buffer_count": 524197,
"read_random_buffer_bytes": 1481151377,
"read_lat": {
"avgcount": 125360,
"sum": 5.359086364,
"avgtime": 4.2749e-05
},
"read_count": 125360,
"read_bytes": 3977205447,
"read_disk_count": 93942,
"read_disk_bytes": 3064020992,
"read_disk_bytes_wal": 0,
"read_disk_bytes_db": 3062026240,
"read_disk_bytes_slow": 1998848,
"read_prefetch_count": 125263,
"read_prefetch_bytes": 3974482470,
"write_count": 16175577,
"write_disk_count": 16177912,
"write_bytes": 239236014080,
"compact_lat": {
"avgcount": 2252,
"sum": 23.429906385,
"avgtime": 0.010404043
},
"compact_lock_lat": {
"avgcount": 2252,
"sum": 1.350269098,
"avgtime": 0.000599586
},
"fsync_lat": {
"avgcount": 8067000,
"sum": 3628.817720852,
"avgtime": 0.000449834
},
"flush_lat": {
"avgcount": 8103605,
"sum": 2142.169290794,
"avgtime": 0.000264347
},
"unlink_lat": {
"avgcount": 10555,
"sum": 0.12053331,
"avgtime": 1.1419e-05
},
"truncate_lat": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"alloc_slow_fallback": 0,
"alloc_slow_size_fallback": 0,
"read_zeros_candidate": 0,
"read_zeros_errors": 0,
"wal_alloc_lat": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"db_alloc_lat": {
"avgcount": 27510,
"sum": 0.330347497,
"avgtime": 1.2008e-05
},
"slow_alloc_lat": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"alloc_wal_max_lat": 0,
"alloc_db_max_lat": 0.003345333,
"alloc_slow_max_lat": 0
},
"rocksdb": {
"get_latency": {
"avgcount": 1661166,
"sum": 53.633803402,
"avgtime": 3.2286e-05
},
"submit_latency": {
"avgcount": 10010390,
"sum": 813.516372663,
"avgtime": 8.1267e-05
},
"submit_sync_latency": {
"avgcount": 8045894,
"sum": 3731.23752681,
"avgtime": 0.000463744
},
"compact": 0,
"compact_running": 0,
"compact_completed": 0,
"compact_lasted": 0,
"compact_queue_merge": 0,
"compact_queue_len": 0,
"rocksdb_write_wal_time": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"rocksdb_write_memtable_time": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"rocksdb_write_delay_time": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"rocksdb_write_pre_and_post_time": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
}
}
}
{
"bluefs": {
"db_total_bytes": 64424501248,
"db_used_bytes": 31445745664,
"wal_total_bytes": 0,
"wal_used_bytes": 0,
"slow_total_bytes": 2000397795328,
"slow_used_bytes": 0,
"num_files": 471,
"log_bytes": 13541376,
"log_compactions": 2029,
"log_write_count": 7270668,
"logged_bytes": 29780656128,
"files_written_wal": 8798,
"files_written_sst": 1366,
"write_count_wal": 7258082,
"write_count_sst": 47800,
"bytes_written_wal": 174856781824,
"bytes_written_sst": 25043046400,
"bytes_written_slow": 0,
"max_bytes_wal": 0,
"max_bytes_db": 60438872064,
"max_bytes_slow": 0,
"alloc_unit_slow": 65536,
"alloc_unit_db": 1048576,
"alloc_unit_wal": 0,
"read_random_lat": {
"avgcount": 769669,
"sum": 47.340726985,
"avgtime": 6.1507e-05
},
"read_random_count": 769669,
"read_random_bytes": 26495066163,
"read_random_disk_count": 254435,
"read_random_disk_bytes": 24946337237,
"read_random_disk_bytes_wal": 0,
"read_random_disk_bytes_db": 24668980024,
"read_random_disk_bytes_slow": 277357213,
"read_random_buffer_count": 517401,
"read_random_buffer_bytes": 1548728926,
"read_lat": {
"avgcount": 169726,
"sum": 8.978258479,
"avgtime": 5.2898e-05
},
"read_count": 169726,
"read_bytes": 5083418859,
"read_disk_count": 113428,
"read_disk_bytes": 4156133376,
"read_disk_bytes_wal": 0,
"read_disk_bytes_db": 3756879872,
"read_disk_bytes_slow": 399257600,
"read_prefetch_count": 145957,
"read_prefetch_bytes": 4303778505,
"write_count": 14579621,
"write_disk_count": 14581706,
"write_bytes": 233965318144,
"compact_lat": {
"avgcount": 2029,
"sum": 20.610673612,
"avgtime": 0.010158045
},
"compact_lock_lat": {
"avgcount": 2029,
"sum": 1.662599252,
"avgtime": 0.000819418
},
"fsync_lat": {
"avgcount": 7268257,
"sum": 3465.742834128,
"avgtime": 0.000476832
},
"flush_lat": {
"avgcount": 7306924,
"sum": 2073.896410872,
"avgtime": 0.000283826
},
"unlink_lat": {
"avgcount": 10587,
"sum": 0.140086417,
"avgtime": 1.3231e-05
},
"truncate_lat": {
"avgcount": 1,
"sum": 1.152e-06,
"avgtime": 1.152e-06
},
"alloc_slow_fallback": 0,
"alloc_slow_size_fallback": 0,
"read_zeros_candidate": 0,
"read_zeros_errors": 0,
"wal_alloc_lat": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"db_alloc_lat": {
"avgcount": 24562,
"sum": 0.325040801,
"avgtime": 1.3233e-05
},
"slow_alloc_lat": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"alloc_wal_max_lat": 0,
"alloc_db_max_lat": 0.000259603,
"alloc_slow_max_lat": 0
},
"rocksdb": {
"get_latency": {
"avgcount": 1922412,
"sum": 88.397899767,
"avgtime": 4.5982e-05
},
"submit_latency": {
"avgcount": 9558177,
"sum": 800.936557968,
"avgtime": 8.3795e-05
},
"submit_sync_latency": {
"avgcount": 7246908,
"sum": 3558.578466937,
"avgtime": 0.000491047
},
"compact": 0,
"compact_running": 0,
"compact_completed": 0,
"compact_lasted": 0,
"compact_queue_merge": 0,
"compact_queue_len": 0,
"rocksdb_write_wal_time": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"rocksdb_write_memtable_time": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"rocksdb_write_delay_time": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
},
"rocksdb_write_pre_and_post_time": {
"avgcount": 0,
"sum": 0,
"avgtime": 0
}
}
}
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