Re: [Xen-users] How do I resize a Physical Partition in a Dom U that's "on" a Logical Volume in the Dom 0?

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Bob Linkonij wrote:

> What I want to do now is increase the size of the Dom U's root
> (/dev/xvdc) partition.  And I want to avoid losing, overwriting, or
> screwing up somehow my data in the process :-)
>
> I know the first step I have to do is increase the size of the right
> LV, that matches the /dev/xvdc1 "root" partition in the Dom U, in the
> Dom 0 first.  I do that with
>
> lvextend -L +4G /dev/VG01 guest_root
>
> Can I do that "hot" without shutting down the Dom U first?  Or do I
> need to shut it down THEN do the lvextend?
You can do that 'hot'

> The next step is what's got me confused.
>
> The lvcreate I did first increased the size of "/dev/xvdc", but now I
> need to grow or extend the "/dev/xvdc1" partition in the Dom U to fill
> up to the maximum available.
>
> Do I do that in the Dom U or in the Dom 0?  I think resize2fs needs to
> be used, since I don't have a Logical Volume in the Dom U.  I just
> don't know.
I'm not clear here - did you partition /dev/xvdc and create a 
filesystem on /dev/xvdc1, or did you create a filesystem on /dev/xvdc 
? I do the latter.
If you create a filesystem on the disk device rather than 
partitioning it, then you can shutdown the guest, use resize2fs to 
enlarge the filesystem in it, and startup the guest.
If you created a partition, then you will need to deal with that. I 
think there was a discussion a while back on mounting partitions from 
a partition. You'll need to enlarge the partition to fill the disk, 
and then you can resize the filesystem in it. Other than doing it 
from within the guest I don't know how to do that. Once you shutdown 
and then start up (NOT reboot) the guest, it will see the new logical 
volume as a bigger disk - I don't know if there is any way to make 
this happen 'live'.
> I'm sorry if I'm just missing what's obvious but I'm kind of confused
> by the whole Logical/Physical differences in the Dom 0 and the Dom U.
You're not alone !

--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
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