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Re: [libvirt] [PATCH] Implement vol delete for disk pools



On Tue, Aug 12, 2008 at 11:58:07PM -0400, Cole Robinson wrote:
> Daniel P. Berrange wrote:
> >
> > This isn't correct because the target path is not guarenteed to point to
> > the master device name /dev/sda1.  The user could have configured it to
> > use a stable path such as /dev/disk/by-uuid/4cb23887-0d02-4e4c-bc95-7599c85afc1a
> >
> >   
> 
> Hmm, I couldn't actually get /dev/disk/by-uuid to work. Seems like the
> vol populating code for disks doesn't take into account the the pools
> target path, and just uses the real partition path.

Yes it does - this is what the virStorageBackendStablePath() method call
does.  What I expect is going on is that you merely created a bunch of
partitions, but don't have any filesystems formatted in them. The UUID
stuff is actually the UUID of the filesystem. If you try with a target
path of /dev/disk/by-path  you'll probably have more luck. If it can't
find a stable path under the target you give, it automatically falls
back to the generic /dev/sdXX path.

The following config should show it in action

<pool type='disk'>
  <name>mydisk</name>
  <source>
    <device path='/dev/sda'>
    </device>
  </source>
  <target>
    <path>/dev/disk/by-path</path>
  </target>
</pool>

Daniel
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