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

Daniel P. Berrange berrange at redhat.com
Wed Jan 23 11:26:52 UTC 2013

On Wed, Jan 23, 2013 at 07:15:27PM +0800, Liu Yuan wrote:
> On 01/23/2013 07:10 PM, Daniel P. Berrange wrote:
> > BTW, where is this local disk cache kept in the filesystem ? For proper
> > security isolation between VMs, the cache location needs to be different
> > for each VM and needs to be included in the SELinux policy.
> it is kept as default in /sheep_store/cache/vdi/xxx (users can specify
> it to another path, such as a faster storage to boots performance) and
> every VM has its dedicated directory to cache its own blocks (maps to
> sheepdog objects).

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.

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