* write-through cache
@ 2012-05-23 23:44 Mandell Degerness
2012-05-24 0:44 ` Josh Durgin
0 siblings, 1 reply; 2+ messages in thread
From: Mandell Degerness @ 2012-05-23 23:44 UTC (permalink / raw)
To: ceph-devel
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?
-Mandell
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: write-through cache
2012-05-23 23:44 write-through cache Mandell Degerness
@ 2012-05-24 0:44 ` Josh Durgin
0 siblings, 0 replies; 2+ messages in thread
From: Josh Durgin @ 2012-05-24 0:44 UTC (permalink / raw)
To: Mandell Degerness; +Cc: ceph-devel
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">
Josh
^ permalink raw reply [flat|nested] 2+ messages in thread
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2012-05-23 23:44 write-through cache Mandell Degerness
2012-05-24 0:44 ` Josh Durgin
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