On 05/23/2012 04:44 PM, Mandell Degerness wrote:
I would like to test the effect of using the new write-through cache on RBD volumes mounted to Openstack VMs. What, precisely, are the changes I need to make to the volume XML in order to do so?
If your only volumes are rbd, you can append :rbd_cache=true:rbd_cache_max_dirty=0 to the image name in the volume xml, so it would include something like
<source protocol="rbd" name="pool/image:rbd_cache=true:rbd_cache_max_dirty=0">
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