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Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm

From: Anthony Liguori
Subject: Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm
Date: Tue, 25 May 2010 08:54:27 -0500
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On 05/25/2010 08:36 AM, Avi Kivity wrote:

We'd need a kernel-level generic snapshot API for this eventually.

or (2) implement BUSE to complement FUSE and CUSE to enable proper userspace block devices.

Likely slow due do lots of copying.  Also needs a snapshot API.

The kernel could use splice.

(ABUSE was proposed a while ago by Zach).

If you want to use a block device within qemu, you almost certainly want to be able to manipulate it on the host using standard tools (like mount and parted) so it stands to reason that addressing this in the kernel makes more sense.

qemu-nbd also allows this.

This reasoning also applies to qcow2, btw.

I know.


Anthony Liguori

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