Re: [Xen-devel] [PATCH] Blktap: Userspace file-based image support.(RFC)

[Dan Smith <danms@xxxxxxxxxx>]

SCT> It depends on the environment.  To support cold/live migration,
SCT> having network-attached storage will be required; and file images
SCT> on NFS would be an extremely simple-to-setup way to achieve that.

Ah, but block devices can play too.  With dm-userspace, we could
migrate a domain from one machine to another, faulting the needed
blocks from its block devices on-demand, and copying the rest in the
background.  This would give us a peer-to-peer setup where block
devices could slowly move from machine to machine, following its
owner.  Once your block was accessed (or copied in the background),
it's local and fast.  A peer-to-peer NAS setup.

What do you think?

-- 
Dan Smith
IBM Linux Technology Center
Open Hypervisor Team
email: danms@xxxxxxxxxx

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