RE: [Xen-users] Re: DomU on LVM

["Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>]

Wolfgang Rosenauer wrote:
> 
> Ross S. W. Walker wrote:
> >> So IMHO a better way to do it is to export each lv as
> >> a separate disk and make one single partition of whole
> >> such disk in domU:
> >> /dev/vg/lv1 -> /dev/hda -> /dev/hda1 --> /
> >> /dev/vg/lv2 -> /dev/hdb -> /dev/hdb1 --> /var
> >> /dev/vg/lv3 -> /dev/hdc -> /dev/hdc1 --> /home
> >>
> >> Resizing is extremly easy (lvextend, resize2fs)
> >> and it can be done online if ext3 is used.
> >>
> >> The only disadvantage is you can't mount such filesystem
> >> directly, you need to run 'kpartx -a' first to map nested
> >> domuU block devies in dom0. But that's also pretty easy.
> > 
> > What would be the practical reason for that as opposed to
> > allocating a bigger LV to contain all partitions?
> 
> For me the advantage would be that I'm able to resize the different 
> partitions. If I use the LV as complete disk I only could extend the 
> last partition in DomU.

You can resize within the domU if you don't overallocate up front.

Typically I will create a 16GB LV for a 8GB / and 2GB swap, or a
32GB LV for a 16GB / and 4GB swap and always leave around 30%
available for future expansion or additional needs. But you
could always bring in another LV to the domU and add it to the
VG within the domU and resize from that.

-Ross

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