[openstack-dev] Questions on the virtual disk's cache type

Daniel P. Berrange berrange at redhat.com
Wed Jan 23 11:44:13 UTC 2013

On Wed, Jan 23, 2013 at 07:39:21PM +0800, Liu Yuan wrote:
> On 01/23/2013 07:26 PM, Daniel P. Berrange wrote:
> > How is the cache path changed ? AFAIK, there's no way todo this in libvirt
> > yet. What is path used for the VM specific directory ? This needs to be
> > put into the SELinux/AppArmour policies otherwise sheepdog will just
> > crash & burn when used in a environment with those active.
> Well, I think libvirt doesn't need care about how sheepdog implement its
> cache nor the VMs. The object cache is located on the node where the
> sheep daemon runs. For e.g,
>               kernel                   network
>   VM on node A ---> QEMU emulated device ---> sheep daemon on node B.
> Then the object cache is located on the node B and is manipulated by
> sheep daemon solely.

Oh, when you said 'local disk' earlier I thought that meant local disk
to the QEMU that is running, whereas you just meant local to the remote
object server node.

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