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) and sheepdog
could expose itself as a synthetic. There are some interesting
ramifications to something like that--namely that you could mount
sheepdog on localhost and interact with it through the vfs.
Very interesting stuff, I'm looking forward to examining more closely.
Regards,
Anthony Liguori
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