Re: [Xen-users] how to add space do LVM based DomU

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Tapas Mishra wrote:

>  I want to know
> 1) How can I add space to LVM based DomU ?
> 2) How can I remove a LVM based DomU
Hmm, more than a bit vague there - I'll have to make a few assumptions.

1) Assuming that you mean the DomU is stored in LVM logical volumes 
defined in Dom0 and exported as block devices to the DomU then :
In Dom0, use LVM to expand the LV - eg "lvm lvresize -L +5G 
/dev/vg0/somedomurootlv" to add 5G.
Shutdown the DomU, and use the appropriate filesystem tool to resize 
the filesystem. Eg, for Ext2/Ext3, it's "resize2fs 
/dev/vg0/somedomurootlv". You'll need to fsck it first, eg "fsck -f 
/dev/vg0/somedomurootlv"
Startup the DomU, it should now have a larger filesystem available to it.

If on the other hand, you are exporting a single block device and 
then running LVM within the DomU, you'll need to resize the Dom0 LVM, 
shutdown and restart the DomU to recognise the change, use a 
partitioning tool to extend the endpoint of the partition holding the 
LVM physical device to use the extra space, and then resize the 
logical volumes as required within the DomU.
I'm not entirely certain of the exact sequence of tools to run, and 
the exact syntax, to do this.
2) Fairly simple - stop the DomU, delete the logical volume(s) it uses.

--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
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