If you are used to “noop” kernel scheduler, you might have been stunned to see that it is nowhere to be found on Red Hat Enterprise Linux (RHEL), AlmaLinux, CentOS v8, Debian v10 and above :
cat /sys/block/sda/queue/scheduler none [mq-deadline] kyber bfq
Well, since then, it has been renamed from “noop” to “none”.
So by using the same method as you were using before, just simply replace “noop” by “none“.
echo 'none' > /sys/block/sda/queue/scheduler
Or “elevator=none” for Grub kernel parameter.