Fedora does not find i/o scheduler

[Chris]

Hello Fedora users,

I have a strange problem! I have several Fedora guests on a KVM
hypervisor (CentOS 6.5) and my Fedora guests doesn't show an I/O
scheduler?

Fedora 20 guest:

# cat /sys/block/vda/queue/scheduler
none

I expect something like: (CentOS 6.5 guest)

# cat /sys/block/vda/queue/scheduler
noop anticipatory deadline [cfq]


Thanks for your help.

--
Chris