Unable to change IO scheduler for virtio disk /dev/vda in RHEL 7.1

Solution Verified - Updated -

Issue

  • Unable to change IO scheduler for virtio disk /dev/vda in RHEL 7.1 The /sys/block/vda/queue/scheduler file shows none for scheduler and does not allow to select any of the IO schedulers viz. deadline, cfq, or noop:

    [root@testsystem ~]# cat /sys/block/vda/queue/scheduler
none

[root@testsystem ~]# echo noop > /sys/block/vda/queue/scheduler
[root@testsystem ~]# cat /sys/block/vda/queue/scheduler
none

[root@testsystem ~]# echo deadline > /sys/block/vda/queue/scheduler
[root@testsystem ~]# cat /sys/block/vda/queue/scheduler
none

    Why does /sys/block/vda/queue/scheduler only show one"?

Environment

  • Red Hat Enterprise Linux 7.1

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