[Qemu-devel] Re: [ANNOUNCE] Sheepdog: Distributed Storage System for KVM

[Alexander Graf]

Am 22.10.2009 um 18:28 schrieb Anthony Liguori <address@hidden>:

> Avi Kivity wrote:
> > On 10/21/2009 07:13 AM, MORITA Kazutaka wrote:
> > > Hi everyone,
> > >
> > > Sheepdog is a distributed storage system for KVM/QEMU. It provides
> > > highly available block level storage volumes to VMs like Amazon EBS.
> > > Sheepdog supports advanced volume management features such as  
> > > snapshot,
> > > cloning, and thin provisioning. Sheepdog runs on several tens or  
> > > hundreds
> > > of nodes, and the architecture is fully symmetric; there is no  
> > > central
> > > node such as a meta-data server.
> >
> > Very interesting!  From a very brief look at the code, it looks  
> > like the sheepdog block format driver is a network client that is  
> > able to access highly available images, yes?
> >
> > If so, is it reasonable to compare this to a cluster file system  
> > setup (like GFS) with images as files on this filesystem?  The  
> > difference would be that clustering is implemented in userspace in  
> > sheepdog, but in the kernel for a clustering filesystem.
>
> I'm still in the process of reading the code, but that's the  
> impression I got too.  It made me think that the protocol for qemu  
> to communicate with sheepdog could be a filesystem protocol (like 9p)

Speaking about 9p, what's the status there?

Alex