Hello! After upgrading "5.15.0-84-generic" to "5.15.0-100-generic" (Ubuntu 22.04.2 LTS) , commit latency started acting weird with "CT4000MX500SSD" drives. osd commit_latency(ms) apply_latency(ms) 36 867 867 37 3045 3045 38 15 15 39 18 18 42 1409 1409 43 1224 1224 I downgraded the kernel but the result did not change. I have a similar build and it didn't get upgraded and it is just fine. While I was digging I realised a difference. This is high latency cluster and as you can see the "DISC-GRAN=0B", "DISC-MAX=0B" root@sd-01:~# lsblk -D NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO sdc 0 0B 0B 0 ├─ceph--76b7d255--2a01--4bd4--8d3e--880190181183-osd--block--201d5050--db0c--41b4--85c4--6416ee989d6c │ 0 0B 0B 0 └─ceph--76b7d255--2a01--4bd4--8d3e--880190181183-osd--block--5a376133--47de--4e29--9b75--2314665c2862 root@sd-01:~# find /sys/ -name provisioning_mode -exec grep -H . {} + | sort /sys/devices/pci0000:80/0000:80:03.0/0000:81:00.0/host0/port-0:0/end_device-0:0/target0:0:0/0:0:0:0/scsi_disk/0:0:0:0/provisioning_mode:full ------------------------------------------------------------------------------------------ This is low latency cluster and as you can see the "DISC-GRAN=4K", "DISC-MAX=2G" root@ud-01:~# lsblk -D NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO sdc 0 4K 2G 0 ├─ceph--7496095f--18c7--41fd--90f2--d9b3e382bc8e-osd--block--ec86a029--23f7--4328--9600--a24a290e3003 │ 0 4K 2G 0 └─ceph--7496095f--18c7--41fd--90f2--d9b3e382bc8e-osd--block--5b69b748--d899--4f55--afc3--2ea3c8a05ca1 root@ud-01:~# find /sys/ -name provisioning_mode -exec grep -H . {} + | sort /sys/devices/pci0000:00/0000:00:11.4/ata3/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0/provisioning_mode:writesame_16 I think the problem is related to provisioning_mode but I really did not understand the reason. I boot with a live iso and still the drive was "provisioning_mode:full" so it means this is not related to my OS at all. With the upgrade something changed and I think during boot sequence negotiation between LSI controller, drives and kernel started to assign "provisioning_mode:full" but I'm not sure. What should I do ? Best regards.