[CentOS-virt] how to add file-based disk space to a guest

Tue Jul 26 23:44:06 UTC 2011
Trey Dockendorf <treydock at gmail.com>

I'm not aware of a virsh attach disk command but if you duplicate the
entries for the existing disk you can then add the new one...something like
this...

# virsh -c qemu:///system edit VMname

    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/vmname_var.qcow2'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
    </disk>

You will have to adjust the values of course.

Why not try doing this with virt-manager?  When I started using KVM (after
moving from ESXi) I had trouble with all the commands and finding everything
I needed, but virt-manager works great.

- Trey


On Tue, Jul 26, 2011 at 4:26 AM, thomas veymont <thomas.veymont at gmail.com>wrote:

> anyone may help on that topic ?
> thanks
>
> 2011/7/20 thomas veymont <thomas.veymont at gmail.com>:
> > hi there,
> >
> > I'm following these documentations to add a file-based disk volume to
> > a KVM guest under Centos 6.0 :
> >
> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization/chap-Virtualization-Storage_Volumes.html
> >
> > as instructed, I created a "pool" then a "volume", file-based, e.g :
> >
> > mkdir /mnt/raid/kvm_pool1
> > virsh # pool-define-as pool1 dir - - - - "/mnt/raid/kvm_pool1"
> > virsh # pool-autostart pool1
> > virsh # vol-create-as pool1 volume1 20G --allocation 15G --format qcow2
> >
> > now I want to associate "volume1" to my guest OS. Following this doc:
> >
> >
> http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization/sect-Virtualization-Virtualized_block_devices-Adding_storage_devices_to_guests.html
> >
> > - why does this ask me to create a file with "dd" ? it's already been
> > created before with the virsh pool commands, isn't it? Seems to
> > me I'm bypassing the libvirt/virsh layer if I do that.
> >
> > - after that, the doc tells me to do some stuff with guest XML files.
> > Is'nt there some specific commands provided by
> > virsh to associate a managed Pool to a managed Guest ?
> >
> > - in this case, should I use the virsh "attach-disk" command ?
> >
> > thanks.
> > --
> > Tom
> >
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