[libvirt-users] Performance tuning questions for mail server

[Robin Lee Powell]

On Mon, Oct 10, 2011 at 05:52:28PM -0400, Alex wrote:
> Hi,
> 
> >> I'm using
> >> deadline scheduler, the /var partition is mounted noatime, and the
> >> disk is mounted raw:
> >>
> >>     <disk type='file' device='disk'>
> >>       <driver name='qemu' type='raw'/>
> >>       <source file='/var/lib/libvirt/images/mail02.img'/>
> >>       <target dev='vda' bus='virtio'/>
> >>       <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> >> function='0x0'/>
> >
> > I meant raw disk devices rather than files e.g.
> > <disk type='block' device='disk'>
> >      <driver name='qemu' type='raw' cache='none'/>
> >      <source dev='/dev/server02_vg1_2tb/lv_vm03_swap'/>
> >      <target dev='vdb' bus='virtio'/>
> > </disk>
> 
> I made this change by editing the xml, restarting libvirtd, then using
> virsh to define the xml file and received this message:
> 
> virsh # define /etc/libvirt/qemu/bwimail02.xml
> error: Failed to define domain from /etc/libvirt/qemu/bwimail02.xml
> error: missing source information for device vda
> 
> Have I done something wrong, or am I missing something?

You'll need to show us the xml file.

-Robin