Hi Janne,
Thank you for your response.
I use `ceph pg deep-scrub <pg_num>` command, and all returns are point the osd.166.
I check SMART data and syslog on osd.166 , the disk are fine.
Now the late deep-scrub PG numbers are lower, however it been 5 days since last post.
I attached the perf dump for that osd. There are tons of values, do you have any suggest for how to read and analysis the values in the report?
Are there any key values worth to notice on below dump result?
ceph daemon osd.166 perf dump
{
"AsyncMessenger::Worker-0": {
"msgr_recv_messages": 19341158,
"msgr_send_messages": 18796191,
"msgr_recv_bytes": 349806218697,
"msgr_send_bytes": 280579883194,
"msgr_created_connections": 45848,
"msgr_active_connections": 371,
"msgr_running_total_time": 3472.846508390,
"msgr_running_send_time": 1303.229556187,
"msgr_running_recv_time": 2666.103910588,
"msgr_running_fast_dispatch_time": 279.453905222,
"msgr_send_messages_queue_lat": {
"avgcount": 18796198,
"sum": 2186.559714335,
"avgtime": 0.000116329
},
"msgr_handle_ack_lat": {
"avgcount": 17717151,
"sum": 8.286058140,
"avgtime": 0.000000467
}
},
"AsyncMessenger::Worker-1": {
"msgr_recv_messages": 15162337,
"msgr_send_messages": 14791166,
"msgr_recv_bytes": 200258563166,
"msgr_send_bytes": 133207293543,
"msgr_created_connections": 44152,
"msgr_active_connections": 377,
"msgr_running_total_time": 2560.268490568,
"msgr_running_send_time": 952.458957466,
"msgr_running_recv_time": 1217.955146530,
"msgr_running_fast_dispatch_time": 232.240019379,
"msgr_send_messages_queue_lat": {
"avgcount": 14791125,
"sum": 1897.607826992,
"avgtime": 0.000128293
},
"msgr_handle_ack_lat": {
"avgcount": 15269688,
"sum": 7.098990800,
"avgtime": 0.000000464
}
},
"AsyncMessenger::Worker-2": {
"msgr_recv_messages": 15677023,
"msgr_send_messages": 15358783,
"msgr_recv_bytes": 228508634479,
"msgr_send_bytes": 211006631139,
"msgr_created_connections": 45406,
"msgr_active_connections": 383,
"msgr_running_total_time": 2759.930104879,
"msgr_running_send_time": 1053.707455802,
"msgr_running_recv_time": 4334.833363876,
"msgr_running_fast_dispatch_time": 239.419774153,
"msgr_send_messages_queue_lat": {
"avgcount": 15358747,
"sum": 2015.660278745,
"avgtime": 0.000131238
},
"msgr_handle_ack_lat": {
"avgcount": 16139329,
"sum": 7.595875666,
"avgtime": 0.000000470
}
},
"bluefs": {
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"reclaim_bytes": 0,
"db_total_bytes": 307090153472,
"db_used_bytes": 7901011968,
"wal_total_bytes": 0,
"wal_used_bytes": 0,
"slow_total_bytes": 400033120256,
"slow_used_bytes": 0,
"num_files": 124,
"log_bytes": 14528512,
"log_compactions": 12,
"logged_bytes": 190578688,
"files_written_wal": 2,
"files_written_sst": 2852,
"bytes_written_wal": 295528103936,
"bytes_written_sst": 121776099328,
"bytes_written_slow": 0,
"max_bytes_wal": 0,
"max_bytes_db": 9753845760,
"max_bytes_slow": 0,
"read_random_count": 2269991,
"read_random_bytes": 135270214328,
"read_random_disk_count": 1190220,
"read_random_disk_bytes": 130232185489,
"read_random_buffer_count": 1086502,
"read_random_buffer_bytes": 5038028839,
"read_count": 333292,
"read_bytes": 13432447950,
"read_prefetch_count": 330425,
"read_prefetch_bytes": 13419652916,
"read_zeros_candidate": 0,
"read_zeros_errors": 0
},
"bluestore": {
"kv_flush_lat": {
"avgcount": 13561020,
"sum": 44.317007002,
"avgtime": 0.000003267
},
"kv_commit_lat": {
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"sum": 8141.086529679,
"avgtime": 0.000600329
},
"kv_sync_lat": {
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"sum": 8185.403536681,
"avgtime": 0.000603597
},
"kv_final_lat": {
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"sum": 852.970428455,
"avgtime": 0.000062958
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"state_prepare_lat": {
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},
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"bluestore_write_big": 1163116,
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"bluestore_write_big_blobs": 1866660,
"bluestore_write_small": 19180172,
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"bluestore_write_small_unused": 565984,
"bluestore_write_small_deferred": 18784709,
"bluestore_write_small_pre_read": 18307775,
"bluestore_write_small_new": 2123046,
"bluestore_txc": 18292548,
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"bluestore_gc_merged": 0,
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"bluestore_fragmentation_micros": 10,
"omap_seek_to_first_lat": {
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},
"omap_upper_bound_lat": {
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"omap_get_keys_lat": {
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},
"cct": {
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},
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}
-----Original Message-----
From: Janne Johansson <icepic.dz@xxxxxxxxx>
Sent: Thursday, May 4, 2023 10:57 PM
To: Peter <petersun@xxxxxxxxxxxx>
Cc: ceph-users@xxxxxxx
Subject: Re: pg deep-scrub issue
>undergo deepscrub and regular scrub cannot be completed in a timely manner. I have noticed that these PGs appear to be concentrated on a single OSD. I am seeking your guidance on how to address this issue and would appreciate any insights or suggestions you may have.
>
The usual "see if there are SMART errors on the drive", "check dmesg for this drive" and see if this OSD has lots larger latencies* than the other similar drives and if any of these are true, take it out of the cluster and replace it with a new working drive.
*) Perhaps with iostat, checking the service time and utilization%, perhaps with "# ceph daemon osd.X perf dump" on the host running this OSD, "ceph osd perf" and see if this one OSD is an outlier in terms of latencies
--
May the most significant bit of your life be positive.
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