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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: Thu, 20 May 2010 16:29:54 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20091209 Fedora/3.0-4.fc12 Lightning/1.0pre Thunderbird/3.0

On 05/20/2010 04:18 PM, Christian Brunner wrote:
Thanks for your comments. I'll send an updated patch in a few days.

Having a central storage system is quite essential in larger hosting
environments, it enables you to move your guest systems from one node
to another easily (live-migration or dynamic restart). Traditionally
this has been done using SAN, iSCSI or NFS. However most of these
systems don't scale very well and and the costs for high-availability
are quite high.

With new approaches like Sheepdog or Ceph, things are getting a lot
cheaper and you can scale your system without disrupting your service.
The concepts are quite similar to what Amazon is doing in their EC2
environment, but they certainly won't publish it as OpenSource anytime

Both projects have advantages and disadvantages. Ceph is a bit more
universal as it implements a whole filesystem. Sheepdog is more
feature complete in regards of managing images (e.g. snapshots). Both
projects require some additional work to become stable, but they are
on a good way.

I would really like to see both drivers in the qemu tree, as they are
the key to a design shift in how storage in the datacenter is being

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? So could we not standardize a protocol for this that both sheepdog and ceph could implement?


Anthony Liguori

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