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Re: [Libguestfs] [PATCH 0/4] Fixes for virt-resize

On Mon, Sep 27, 2010 at 05:14:08PM +0100, Richard W.M. Jones wrote:
> I'm still doing testing on these, but the patches seem good
> enough to review.

I should note that this won't necessarily let you do a resize:

><fs> pvresize-size /dev/sda2 6G
libguestfs: error: pvresize_size: /dev/vda2:   /dev/vda2: cannot resize to 191 extents as later ones are allocated.

It turns out that pvresize won't "defrag" physical extents, therefore
it is a matter of luck whether you can shrink a PV.

Reading around the issue it seems you can manually move PEs using
pvmove, lvdisplay, guesswork and luck.  There might be scope for a
"pvdefrag" command in libguestfs at some point ...


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines.  Supports shell scripting,
bindings from many languages.  http://et.redhat.com/~rjones/libguestfs/
See what it can do: http://et.redhat.com/~rjones/libguestfs/recipes.html

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