I updated the state model (attached) to include an error state. Couldn’t see how to delete attachments so maybe someone here has better luck? I also began to add identifiers to each process transition but the diagram started to become cluttered so left them out. Andy From: occi-wg-bounces@ogf.org [mailto:occi-wg-bounces@ogf.org] On Behalf Of Sam Johnston Sent: 20 April 2009 11:56 To: Tino Vazquez Cc: occi-wg@ogf.org; Molino, VictorX M; Thijs Metsch Subject: Re: [occi-wg] OCCI MC - State Machine Diagram Hi Tino, A lot of this is covered in the state registry<http://forge.ogf.org/sf/wiki/do/viewPage/projects.occi-wg/wiki/Registries> (which I'll copy below for you) but comments inline nonetheless. On Mon, Apr 20, 2009 at 12:35 PM, Tino Vazquez <tinova@fdi.ucm.es<mailto:tinova@fdi.ucm.es>> wrote: Howdy everyone, Excellent thread. My three cents: 1) I think we should define clearly the semantics of the states. for instance, what is the difference between STOPPED and SUSPENDED? Is it that with SUSPENDED the state is saved and not with STOPPED? Yes, it's exactly that. From the state registry: STOPPED = "The resource is inactive and has no saved state" and SUSPENDED="The resource is inactive and has saved state" 2) I really think we need an entry state like "PENDING" or "DEFINED". It will help in implementation relying on a best-effort scheduler to match VMs and hosts, like EC2 does. This will be the state where machines will wait for a host to be available to run on. Also, I don't really think that a machine entering its life cycle in SUSPENDED state is a good idea. I tend to agree, but I'd like the terminology to be completely unambiguous... something like "NEW" [for this AS]. 3) +1 to the "CRASHED", "ERROR" or "FAILED" state. ABORT[ING|ED] = "The resource encountered an error and is aborting/has aborted". What do you think? Some of these transitions take a while so some way of indicating progress (especially interesting for long tasks like live migrations) would be useful. Would prefer a mechanism that worked universally for the API. Sam Extensions State control State Transitions Description aborting aborted The resource encountered an error and is aborting aborted n/a The resource encountered an error and has aborted active pause, restart, stop, suspend The resource is active resuming aborting, active The resource is becoming active and restoring state pausing aborting, paused The resource is preparing to refuse new requests paused aborting, resume The resource is refusing new requests starting aborting, active The resource is becoming active stopped start The resource is inactive and has no saved state stopping stopped, aborting The resource is becoming inactive and destroying state suspended resume, stop The resource is inactive and has saved state Note: Stable states and user transitions in bold. ------------------------------------------------------------- Intel Ireland Limited (Branch) Collinstown Industrial Park, Leixlip, County Kildare, Ireland Registered Number: E902934 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.
