Openstack&ceph Configuration using RBD cache

Environment DescriptionOpenstack Icehouse Ceph 0.87 Configuration Steps
Configuring Ceph
Add the following to the ceph.conf configuration file

RBD cache = True
RBD cache Writethrough until Flush = True

RBD Cache also has some configuration properties that can be changed as needed

#rbd Cache size 
#rbd cache max Dirty 
#rbd cache target Dirty 

Configure OpenStack
Add the following to the [Default] field in the nova.conf configuration file

Disk_cachemodes= "Network=writeback"

Then start instance view Libvirt.xml file to view the cache mode as writeback

<disk type= "Network" device= "Disk" >
      <driver name= "QEMU" type= "raw" cache= "writeback"/>
      < SOURCE protocol= "RBD" name= "Volumes/volume-2b2db46b-8b22-40f9-bde9-7df7c3c8e9b7" >