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xen-users
Re: [Xen-users] DomUs and hard disks
Luis Roberto Romano wrote:
According to the documentation I've read, there's 2 ways to make the
virtual disks for DomUs storage:
1 - Image-based disks.
2 - LVM disks
But, I was wondering if I can assign a regular partition (e.g sda1)
to a DomU, instead of a LVM.
I'm guessing you've read a few "here's a recipe for doing Xen" pages
and those are the only options used by the authors ?
You have great flexibility in assigning devices - you can assign a
partition (eg sda3), a whole disk (eg sdc), and LVM lv (eg
vg0/domuroot), and I assume (but I've not tried it) an MD raid device
(eg md/domuraid). Oh and lets not forget iSCSI volumes where you get
pretty well the same options (you can pass the entire device or a
partition on it).
As already said, using LVM just makes life so much easier as you can
dynamically create/resize/remove volumes as your DomU needs change.
For that reason, with only two exceptions*, all my DomU volumes are
LVM LVs.
* One is an iSCSI volume at work, the other is a video storage disk
on my MythTV system at home where I've given the guest an entire disk
to itself.
What you do is really down to your own preferences. There are
tradoffs - eg managing lots of LVM LVs in Dom0 and using "one
filesystem per disk" in DomU vs managing just one per DomU and
partitioning it within the DomU.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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