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Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm
From: |
MORITA Kazutaka |
Subject: |
Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm |
Date: |
Mon, 24 May 2010 16:12:23 +0900 |
User-agent: |
Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (Gojō) APEL/10.7 Emacs/22.3 (x86_64-pc-linux-gnu) MULE/5.0 (SAKAKI) |
At Sun, 23 May 2010 15:01:59 +0300,
Avi Kivity wrote:
>
> On 05/21/2010 12:29 AM, Anthony Liguori wrote:
> >
> > I'd be more interested in enabling people to build these types of
> > storage systems without touching qemu.
> >
> > Both sheepdog and ceph ultimately transmit I/O over a socket to a
> > central daemon, right?
>
> That incurs an extra copy.
>
> > So could we not standardize a protocol for this that both sheepdog and
> > ceph could implement?
>
> The protocol already exists, nbd. It doesn't support snapshotting etc.
> but we could extend it.
>
I have no objection to use another protocol for Sheepdog support, but
I think nbd protocol is unsuitable for the large storage pool with
many VM images. It is because nbd protocol doesn't support specifing
a file name to open. If we use nbd with such a storage system, the
server needs to listen ports as many as the number of VM images. As
far as I see the protocol, It looks difficult to extend it without
breaking backward compatibility.
Regards,
Kazutaka
> But IMO what's needed is a plugin API for the block layer.
>
- [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Christian Brunner, 2010/05/19
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Blue Swirl, 2010/05/20
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Avi Kivity, 2010/05/23
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm,
MORITA Kazutaka <=
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Avi Kivity, 2010/05/24
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, MORITA Kazutaka, 2010/05/24
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Avi Kivity, 2010/05/24
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Cláudio Martins, 2010/05/24
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, MORITA Kazutaka, 2010/05/24
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Christian Brunner, 2010/05/24
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Anthony Liguori, 2010/05/24
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Avi Kivity, 2010/05/25
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Anthony Liguori, 2010/05/25
- Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm, Avi Kivity, 2010/05/25