[Xen-devel] QCOW snapshots and recursive file backings

To:	xen-devel@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-devel] QCOW snapshots and recursive file backings
From:	"Mike Sun" <msun@xxxxxxxxxx>
Date:	Mon, 17 Nov 2008 13:11:36 -0500
Delivery-date:	Mon, 17 Nov 2008 10:11:58 -0800
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Hi,

Trying to understand the current state of affairs with QCOW support in
Xen with the blktap driver.  It's been made clear that a deviation
from QEMU's implementation of QCOW has occurred and that the QCOW
files used in Xen must be created with the associated Xen tools only
(e.g. qcow-create) and that images between QEMU and Xen are not
interchangeable.

My first question is probably a more general QCOW one, does the QCOW
format provide for stackable/recursive backings, e.g. one QCOW file is
backed by another QCOW file which is backed by another one and so
on...?

Second question is whether the snapshot feature in the new QCOW2
format in QEMU is available in Xen.

Thanks,
Mike

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[Xen-devel] QCOW snapshots and recursive file backings