<div style="font-family: Helvetica; font-size: 13px; ">ceph.conf provides caching for rbd itself, but it has nothing to do with KVM afaik. But you can set caching parameters in disk section of vm template (cache=writeback, for instance). Take a look here <a href="http://ceph.com/docs/next/rbd/qemu-rbd/">http://ceph.com/docs/next/rbd/qemu-rbd/</a> for details. But it seems that this setting doesn't really help: <a href="http://www.sebastien-han.fr/blog/2012/08/26/ceph-benchmarks/">http://www.sebastien-han.fr/blog/2012/08/26/ceph-benchmarks/</a> <a href="http://www.mail-archive.com/ceph-users@lists.ceph.com/msg01284.html">http://www.mail-archive.com/ceph-users@lists.ceph.com/msg01284.html</a><br></div>
<div><div><br></div><div>-- </div><div>Artem Salpagarov</div><div><br></div></div>
<p style="color: #A0A0A8;">On Monday, July 29, 2013 at 6:12 PM, Jaime Melis wrote:</p>
<blockquote type="cite" style="border-left-style:solid;border-width:1px;margin-left:0px;padding-left:10px;">
<span><div><div><div dir="ltr">Hi Harald,<div><br></div><div>you might have better luck asking this at the Ceph mailing list?</div><div><br></div><div>regards,</div><div>Jaime</div></div><div><br><br><div>
On Tue, Jul 16, 2013 at 2:50 AM, Harald Rößler <span dir="ltr"><<a href="mailto:Harald.Roessler@btd.de" target="_blank">Harald.Roessler@btd.de</a>></span> wrote:<br><blockquote type="cite"><div>
Hi,<br>
<br>
how I can enable the RBD caching for the VM's which have the underlying<br>
Ceph file system? At the moment I have add the the caching in the<br>
ceph.conf, but I'm not sure if this is the right place.<br>
<br>
-----<br>
<br>
[global]<br>
rbd cache = true<br>
rbd cache size = 134217728<br>
rbd cache max dirty = 100663296<br>
rbd cache target dirty = 67108864<br>
rbd cache max dirty age = 5<br>
<br>
-----<br>
<br>
Thanks<br>
Kind Regards<br>
Harald Roessler<br>
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</div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Join us at <a href="http://opennebulaconf.com/" style="color:rgb(17,85,204)" target="_blank">OpenNebulaConf2013</a> in Berlin, <span><span>24-26 September, 2013</span></span><br>
--<div>Jaime Melis<br>Project Engineer<br>OpenNebula - The Open Source Toolkit for Cloud Computing<br><a href="http://www.OpenNebula.org" target="_blank">www.OpenNebula.org</a> | <a href="mailto:jmelis@opennebula.org" target="_blank">jmelis@opennebula.org</a></div>
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</blockquote>
<div>
<br>
</div>