[PVE-User] Problems changing I/O Scheduler with grub

[Keri Alleyne]

Hello.

We're running Proxmox VE 3.4-6.

Followed the instructions outlined here: 
https://pve.proxmox.com/wiki/IO_Scheduler

The /etc/default/grub file contains this line: 
GRUB_CMDLINE_LINUX_DEFAULT="quiet elevator=deadline"

We ran: update-grub

Restarted system.

Now, all drives are set to [noop]:

root at pve:~# cat /sys/block/sda/queue/scheduler
[noop] anticipatory deadline cfq
root at pve:~# cat /sys/block/sdb/queue/scheduler
[noop] anticipatory deadline cfq
root at pve:~# cat /sys/block/sdc/queue/scheduler
[noop] anticipatory deadline cfq

Why is this happening? Did I miss a step or is something broken when 
changing the I/O scheduler through grub?

Thanks.