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Re: [Xen-users] Resize Guest Disk

To: Nick Couchman <Nick.Couchman@xxxxxxxxx>
Subject: Re: [Xen-users] Resize Guest Disk
From: Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date: Tue, 8 Sep 2009 13:52:00 -0700
Cc: Florian Rahmann <admin@xxxxxxxxxxxxxxxxxxxxx>, xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
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On Tue, Sep 8, 2009 at 11:26 AM, Nick Couchman <Nick.Couchman@xxxxxxxxx> wrote:

Oh, and if you've partitioned the LV inside the guest, you'll also need to resize the partition (BEFORE you do a resize2fs, etc.).  There are two ways to do this - the safest is to use parted, which works if you're using ext2/ext3 (and a couple other of the most popular filesystems - reiser, I think).  The other method is to delete the partition and recreate it with the extended end points.  This isn't quite as safe and requires that 1) you're start point for the partition is exactly the same as it was before, and 2) the partition is the last (or only) one on the LV.


Yep, this is true.

Boot the guest and cat /proc/partitions, it should reflect the increased disk size. If you have one partition on it start fdisk, delete the one partition (don't sweat it, just DO NOT reboot in the middle) and create a new one with the same number and starting cylinder (probably the default cylinder for both start and end). Now save and exit. You'll probably have to reboot the domU.

Once rebooted do a resize2fs on the filesystem eg. resize2fs / and you're done.

If you used LVM in the domU then you can resize the LV the same way you did on the dom0 and then resize2fs the filesystem.

If however that one LV is used in the domU as a harddrive (/dev/xvda) and you have multiple partitions things get messier. Hopefully the partition you want to resize is the last one and you can just follow the instructions above. If it's in the middle you have a lot more work ahead.

If you used LVM in the domU then you can resize the LV the same way you did on the dm0 and then resize2fs the filesystem.

-- Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows."
Now they have two problems.
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