[Sheepdog] [PATCH v6] block: add sheepdog driver for distributed storage support

[Kevin Wolf]

Am 20.06.2010 22:01, schrieb MORITA Kazutaka:
> Sheepdog is a distributed storage system for QEMU. It provides highly
> available block level storage volumes to VMs like Amazon EBS.  This
> patch adds a qemu block driver for Sheepdog.
> 
> Sheepdog features are:
> - No node in the cluster is special (no metadata node, no control
>   node, etc)
> - Linear scalability in performance and capacity
> - No single point of failure
> - Autonomous management (zero configuration)
> - Useful volume management support such as snapshot and cloning
> - Thin provisioning
> - Autonomous load balancing
> 
> The more details are available at the project site:
>     http://www.osrg.net/sheepdog/
> 
> Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>

Thanks, applied to the block branch.

> Sheepdog passes almost all testcases against a raw format, but failed in
> the following ones:
>  - 005: Sheepdog cannot support a larger image than 4 TB, so failed in
>         creating a 5 TB image.
>  - 012: Sheepdog images are not files, so cannot make them read-only
>         by chmod.

Both of them mean that you haven't adapted qemu-iotests to the
capabilities of Sheepdog, but are not real problems.

We'll probably find some more problems in corner cases, but in general
it looks good enough to me to be included. We can do any other fixes and
cleanups on top of this.

Kevin