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xen-users
Re: [Xen-users] increase size for dom guest using lvm online
At the moment, I believe the size passed to the guest is fixed at
creating time, so if you enlarge the volume, the guest won't get to
know about it until it is shut down and re-created.
I just verified that this is the case on Xen 3.2 on Debian 5. I was not
able to get the guest to pick up the change in device size.
There is the option of doing LVM in the guest, though this will make the
volumes more difficult to access from the Xen dom0. If you do lvm in
the guest you will be able to attach a new chunk of disk, then run
pvcreate on it and add it to a volume group in your guest. However if
the dom0 is running lvm as well it will try to register the volume
groups defined by the PVs that you are intending to map through to your
guests. You have two options for preventing this from creating problems
on the dom0. First, you could exclude from the scan process in lvm.conf
those devices destined to be used with LVM in a guest, but you will not
be able to mount these volumes in the dom0 as a result. The other
option is to name your volume groups differently for every guest so
there are no conflicts when lvm in the dom0 does a pvscan, this allows
you to use the volumes from dom0 but can be a manageability issue.
Personally I don't think the tradeoffs are worth it for online resize.
I do my LVM on the dom0 and then send individual LVs to the guests as
xvda, xvdb, etc. but I cannot resize these without a reboot.
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