Thanks maswan for the later logs as discussed. TL;DR: the kernel now no more knows/considers this as a raid
It now merged write requests: wrqm/s 0 -> ~500 The writes are bigger due to that x8: avgrq-sz ~1000 -> ~8000 But we know it is a raid, it has to split it on stripe size And we can see x8 in time would be ok, but we see: w_await ~10 -> ~600 I asked on IRC for the following on good/bad case while checking source. $ for i in /sys/class/block/sda/queue/iosched/* /sys/class/block/sda/queue/*; do echo $i $(cat $i); done -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1668557 Title: Write performance regression severely affecting hpsa controllers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1668557/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
