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xen-devel
Re: [Xen-devel] [PATCH] xenctld - a control channel multiplexing daemon
On Wed, 2005-01-26 at 08:33, Andrew Warfield wrote:
> Having the store worked in properly should 1. make rebooting dom0 with
> active VMs unaffected more possible, 2. make adding new functionality
> (e.g. new split device types) more straightforward, and 3. make
> writing tools that need state information, and 4. scaling control up
> to a cluster all a lot more tractable.
It seems like there's two distinct problems.
1) Managing domain specific state for running domains.
This can be done easily enough since a domid is a unique identifier.
Any associative database would work just fine.
2) Managing domain specific state for non-running domains.
Since non-running domains have to have some sort of disk representation
(either a config file of some sort or a snapshot image) this also is
pretty easy.
I'm not convinced there's a great way to merge the two though. It gets
really hairy once you start doing things like cloning or migration.
There's a lot of subtle things like reassigning MAC addresses that gets
nasty.
In reality, what's the different between a domain that's suspended to
disk and a clone domain that just hasn't been started yet.
Does the current persistent store architecture attempt to solve this
problem? Does it attempt to solve both problems?
I'd like to see a persistent store that just addressed problem #1. I
think once you get into trying to solve #2, you'll create a solution
that won't work for everyone.
I'd like to see Xen with a tool that can create domains from a
configuration file but at the same time, it would be nice if the
persistent store worked well with domain's that are created by hand.
Regards,
--
Anthony Liguori
Linux Technology Center (LTC) - IBM Austin
E-mail: aliguori@xxxxxxxxxx
Phone: (512) 838-1208
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