Hi, I have a strange behaviour of my osd, on multiple clusters, All cluster are running mimic 13.2.1,bluestore, with ssd or nvme drivers, workload is rbd only, with qemu-kvm vms running with librbd + snapshot/rbd export-diff/snapshotdelete each day for backup When the osd are refreshly started, the commit latency is between 0,5-1ms. But overtime, this latency increase slowly (maybe around 1ms by day), until reaching crazy values like 20-200ms. Some example graphs: http://odisoweb1.odiso.net/osdlatency1.png http://odisoweb1.odiso.net/osdlatency2.png All osds have this behaviour, in all clusters. The latency of physical disks is ok. (Clusters are far to be full loaded) And if I restart the osd, the latency come back to 0,5-1ms. That's remember me old tcmalloc bug, but maybe could it be a bluestore memory bug ? Any Hints for counters/logs to check ? Regards, Alexandre
