Am 03.07.2020 um 18:54 schrieb Rick Gutierrez: > hi list, i am trying to change the input and output scheduler on my > disks, and it does not allow me , > I have several virtualized vm over kvm, and when I try to make the > change it shows me this message: > > echo "noop" > /sys/block/vda/queue/scheduler > > -bash: echo: write error: Invalid argument > > kernel version: > > 3.10.0-1127.13.1.el7.x86_64 > > any idea? I would guess that the scheduler "noop" isn't available, thus that specific error message. On my physical Server CentOS 7 with latest kernel: # cat /sys/block/nvme0n1/queue/scheduler [none] mq-deadline kyber The KVM VM on that host, too CentOS 7 with latest kernel: # cat /sys/block/vda/queue/scheduler [mq-deadline] kyber none Alexander