Re: [Xen-users] what's correct way of shrinking LVM based domU?

[John Haxby <john.haxby@xxxxxxxxxx>]

Rudi Ahlers wrote:
> Hi all
>
> I want to shrink one of my LVM based domU's, but don't quite know how 
> to do it.
> I have searched the Wiki  & HOWTO's, and they all show you how expand 
> / enlarge a LVM based domU, but not shrinking it.
It's the opposite, literally, of growing.
> So, I stopped (destroyed) the domU, and then resized it as follows: 
> lvresize /dev/data/cpanel1 -L10GB (It was 100GB), but when I a started 
> it up again, I got some errors about the the disk being corrupt, and 
> then a kernel panic.
Looks like you missed out a vital step: you shrunk the logical volume 
without first shrinking the file system within it.  Note that while you 
can often grow a file system while it is on-line you almost always need 
the file system off-line in order to shrink it.
In this case, you need to shrink the file system, logical volume (if 
any), physical volume (if any) and partition in the guest OS _before_ 
you shrink the logical volume that contains them all in dom0.  Of 
course, you can do all this from dom0 because the file system(s) contain 
in the logical volume are all off-line.
jch

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