Re: [Xen-users] File2LVM?

[John Morris <jman@xxxxxxxxxxx>]

> > If you create the LV greater than the size of the file, once you have
> > dd it across, can you extend the root size ? all will it autodetect
> > the new size ?
> >     
> create a larger LV, run the dd, then use resize2fs (assuming you're
> using ext2/3) to extend the filesystem to the full LV size.
>
> You can do this at any time. shutdown guest, extend LV, resize2fs, boot
> guest back up (though lvresize has the --resizefs option too which just
> runs resize2fs for you i think).
>   
This works great if your filesystem is directly on the (raw) LV.  
However, if you've put a partition table on the LV, it's not as easy.  I 
guess you have to edit the partition table to tell it the new size of 
the 'disk' (LV), and then find some way to extend your partitions (maybe 
parted?).
I tried to do this sometime back and experienced some weirdness with the 
cylinders/heads/sectors not being detected correctly (fancy that!), and 
never got the disk geometry entered correctly.  Parted didn't like the 
resized LV, either, as I remember.
Might be that the easiest way to deal with this is from within a domU.  
Pass the LV to the domU as a second disk (xvdb), and partition the LV 
from within the domU.  Then it's easy to use dd from within the domU 
(though you may be dding a running fs), or shut down the domU and use 
kpartx from the dom0 and dd between the mapped devices.  You can use 
resize2fs on the newly dded device.  Don't forget to kpartx -d!
   John


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