maybe its wrong to revive this, i read a bit more and stumbled over the io scheduler, openzfs got their own scheduler. for ssd’s and zfs fs there should be none set, ages ago it was called noop.
ive looked into my setup, debian 12, and found it mq-deadline was still set on my disk in the zpool.
root@debian-server:~# cat /sys/block/sdf/queue/scheduler
[mq-deadline] none
root@debian-server:~# cat /sys/block/sde/queue/scheduler
[mq-deadline] none
i didnt found any specific statement that this could be a “problem”, is desired or can slow things down.
anyone with some knowledge about this?