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bluestore_block_db_size ignored

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Ingo Hellmer
19 Posts
July 10, 2023, 6:15 am

I am using PetaSAN 3.1. I was successful on three OSDs. The other three I will try when I have the next maintenance slot.

Here the value before

ceph daemon osd.6 perf dump | jq '{bluefs:.bluefs}'
{
"bluefs": {
"gift_bytes": 0,
"reclaim_bytes": 0,
"db_total_bytes": 794567872512,
"db_used_bytes": 42356150272,
"wal_total_bytes": 0,
"wal_used_bytes": 0,
"slow_total_bytes": 351843581952,
"slow_used_bytes": 66498461696,
"num_files": 1730,
"log_bytes": 9670656,
"log_compactions": 29,
"logged_bytes": 465784832,
"files_written_wal": 2,
"files_written_sst": 8760,
"bytes_written_wal": 187023945728,
"bytes_written_sst": 514929278976,
"bytes_written_slow": 0,
"max_bytes_wal": 0,
"max_bytes_db": 46491734016,
"max_bytes_slow": 0,
"read_random_count": 30085874,
"read_random_bytes": 707852574430,
"read_random_disk_count": 12452426,
"read_random_disk_bytes": 621318558952,
"read_random_buffer_count": 17751574,
"read_random_buffer_bytes": 86534015478,
"read_count": 6727080,
"read_bytes": 185227070725,
"read_prefetch_count": 6716055,
"read_prefetch_bytes": 184865965093,
"read_zeros_candidate": 0,
"read_zeros_errors": 0
}
}

and after compact

ceph daemon osd.6 perf dump | jq '{bluefs:.bluefs}'
{
"bluefs": {
"gift_bytes": 0,
"reclaim_bytes": 0,
"db_total_bytes": 794567872512,
"db_used_bytes": 92989788160,
"wal_total_bytes": 0,
"wal_used_bytes": 0,
"slow_total_bytes": 351843581952,
"slow_used_bytes": 0,
"num_files": 1362,
"log_bytes": 2453504,
"log_compactions": 0,
"logged_bytes": 1085440,
"files_written_wal": 1,
"files_written_sst": 0,
"bytes_written_wal": 44199936,
"bytes_written_sst": 0,
"bytes_written_slow": 0,
"max_bytes_wal": 0,
"max_bytes_db": 92989788160,
"max_bytes_slow": 0,
"read_random_count": 33987,
"read_random_bytes": 166101580,
"read_random_disk_count": 1540,
"read_random_disk_bytes": 47363313,
"read_random_buffer_count": 32448,
"read_random_buffer_bytes": 118738267,
"read_count": 2531,
"read_bytes": 143946259,
"read_prefetch_count": 2297,
"read_prefetch_bytes": 137845150,
"read_zeros_candidate": 0,
"read_zeros_errors": 0
}
}

 

I think the slow bytes used is the value that shows the spillover.

#11

admin
2,930 Posts
July 10, 2023, 3:54 pm

Very good, the manual compaction fixed it. Note that the OSD will regularly perform db compaction so it should resolved by itself.

#12
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