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Re: [Xen-users] xen with dynamic slices

To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Subject: Re: [Xen-users] xen with dynamic slices
From: alex <alex.faq8@xxxxxxxxx>
Date: Tue, 8 Sep 2009 17:09:09 +0400
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Yes, you right, thank you.
I have Debian Lenny on dom0 and use LVM.
When I am using files: I do
dd if=/dev/zero of=/myfile bs=1024k count=100000
And I have 100Gb file.
Fajar, how can I overcommit storage ? I can't see different between using LVM or files to overcommit storage.

2009/9/8 Fajar A. Nugraha <fajar@xxxxxxxxx>
On Tue, Sep 8, 2009 at 5:43 PM, alex<alex.faq8@xxxxxxxxx> wrote:
> Hi.
> I want use xen with dynamic slices. For example, I have 20 domU based on
> FreeBSD, xen hypervisor 3.3.1, Debian Lenny dom0 system.
> All domUs have 80Gb LVM partitions, but realy they use 20 of this 80Gb and I
> want to create more domU's.
> How can I do it? I know that some virtualisation have possibility to do
> dynamic slices(4 example Virtul box)

Do you mean storage overcommit? That is, assign more storage to domU
than what you actually have?

If yes, it's not a matter of Xen vs VirtualBox. It's a matter of what
storage backend you use. If you use one of these:
- sparse raw file (with file: or tap:aio:)
- qcow
- vmdk/vdisk (I think full support is only in newer Xen or Opensolaris)
- zvol (on Opensolaris)

then you can overcommit storage. But if you use disk/partition/LVM for
domU storage, you won't be able to.


Best Regards,

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