[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] RFC: "local" communications
Anthony Liguori wrote: Rik van Riel wrote:Hi, When combining clustering with cluster storage, the situation arises where virtual machines are not only managed by the cluster software, but also need to participate in the cluster software themselves... In order for this to work better, it would be good if there was a way for software in a domU to communicate with software on the local dom0 - so after being migrated elsewhere, a guest would start talking to the new dom0 automatically. Rik, is this a heartbeat kind of protocol or some such thing? Is there value to making it be a generic solution that would work when communicating in a non-xen environment? Should it be some virtual device analogous to the virtual network driver, or should we have some other kind of socket for node local communications ? Using protocols like TCP for node-local comms is undesirable as TCP is engineered for the heavy machinery of the Internet. UDP or raw sockets will be somewhat better, although AF_UNIX would be best of all (albeit with its own constraints). I can only speak for myself, but I'd personally like to see a small userspace library that established a datagram connection between two domains (using an event channel and a shared page) that could be reused for many applications.What kind of approach would the Xen community (that's you, if you read this far) prefer ? Which datagram service, Anthony? Having a small lib like this would be a good idea, although the benefit would be in the details, and of course, depending on how many apps we need to support that we don't want to modify... If it could be used with normal read/write calls that would be even better (although first thought is that that would require a daemon). Probably don't want to do that... thanks, Nivedita _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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