Hi guys, Could someone explain what's the new perf stats show and if the numbers are reasonable on my cluster?
I am concerned about the high fs_commit_latency, which seems to be above 150ms for all osds. I've tried to find the documentation on what this command actually shows, but couldn't find anything. I am using 3TB sas drives with 4 osd journals on each ssd. Are the numbers below reasonable for a fairly idle ceph cluster (osd utilisation below 10% on average)? # ceph osd perf osdid fs_commit_latency(ms) fs_apply_latency(ms) 0 192 4 1 265 4 2 116 1 3 125 2 4 166 1 5 209 3 6 184 6 7 142 2 8 209 1 9 166 1 10 216 1 11 308 3 12 150 2 13 125 1 14 175 2 15 142 2 16 150 4 when the cluster get's a bit busy (osd utilisation below 50% on average) I see: # ceph osd perf osdid fs_commit_latency(ms) fs_apply_latency(ms) 0 551 11 1 284 25 2 517 41 3 492 14 4 625 13 5 309 26 6 650 9 7 517 21 8 634 25 9 784 32 10 392 7 11 501 8 12 602 12 13 467 14 14 476 36 15 451 11 16 383 21 Thanks Andrei
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