>
> Gerd Hoffmann wrote:
> > Robin Bowes wrote:
> >> I can increase the size of the under-lying logical volume
> >> (/dev/vg01/lv_bah_vm) e.g increase it from 10GB to 15GB. But, even
> >> though I've resized the under-lying LV, the PV in the Xen guest is
> >> still only 10GB.
> >>
> >> How do I get the PV inside the Xen guest to reflect the increased
> >> size of the under-lying disk, i.e. appear to be 15GB?
> >
> > I think you can't resize PVs. How about creating a new /dev/hda3
> > partition (inside the guest) using the new disk space,
> create a new pv
> > there, add that to the volume group?
>
> Thanks for all the suggestions.
>
> I have since realised what I'm missing: the PV/VG is actually
> created from a partition, i.e the under-lying disk is
> /dev/xvda, so I have /boot as /dev/xvda1 and the PV is
> /dev/xvda2. So, to resize it, I need to boot into a rescue
> disk or live CD and rezize the /dev/xvda2 partition. The PV
> should then reflect the increased size. I can then increase
> the partition size and grow the FS.
>
Are all these layers *really* required??? Seems messy to have LVM ontop of
LVM (even if the OS doesn't realise this is the case).
ATM for my Xen boxes I use LVM in the Dom0 and use this to create my DomU
drives. For instance I have Dom0 and DomU VGs in my Dom0. I then create the
usual set of LVs for each Dom0/U and make them accessible to the DomU in the
usual way (as sda1,sda2, etc, etc).
VG-Dom0
- LVRoot
- LVSwap
- LVwhatever
VG-DomU
- LVDomU1-root
- LVDomU1-swap
- LVDomU1-whatever
- LVDomU2-root
- LVDomU2-swap
- LVDomU2-whatever
With this I can extend the LVs in the Dom0, and either shutdown the DomU and
resize2fs from Dom0 or even (tested on test VMs and low-use production ones)
resize online within the DomU. Works fine and I still get the manageability
of LVM within my DomU's without actually using LVM within them.
Just makes it simpler in my little head :) or am I missing a trick here???
Dan
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