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This bug has been copied from bug #1277248 and has been proposed
to be backported to 7.2 z-stream (EUS).

on qemu-kvm-1.5.3-105.el7

/usr/libexec/qemu-kvm -M pc -S -monitor stdio -vnc none -smp 1 -m 1024 -net none -vga none -drive file=rbd:qemu-kvm-pool/test.raw:mon_host=10.66.9.236,id='rbd',format=raw,cache=none
QEMU 1.5.3 monitor - type 'help' for more information


[root@dhcp-9-69 ~]# ceph --admin-daemon /var/run/ceph/asok config show | grep rbd_cache\"
  "rbd_cache": "true",


=======================

on qemu-kvm-1.5.3-105.el7_2.1

[root@dhcp-9-69 ~]# /usr/libexec/qemu-kvm -M pc -S -monitor stdio -vnc none -smp 1 -m 1024 -net none -vga none -drive file=rbd:qemu-kvm-pool/test.raw:mon_host=10.66.9.236,id='rbd',format=raw,cache=none
QEMU 1.5.3 monitor - type 'help' for more information
(qemu) info version 
1.5.3 (qemu-kvm-1.5.3-105.el7_2.1)


[root@dhcp-9-69 ~]# ceph --admin-daemon /var/run/ceph/asok config show | grep rbd_cache\"
  "rbd_cache": "false",




Based on above, this bug has been fixed correctly,
move to VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2569.html