[occi-wg] OCCI MC - State Machine Diagram

Randy Bias randyb at gogrid.com
Thu Apr 23 16:10:41 CDT 2009

I would personally shy away from trying to specify multiple error states.
My past experience is that this is an endless bucket.  Systems fail in lots
of ways.  Once you start specifying error states you won't stop.


On 4/20/09 6:02 AM, "Michael Richardson" <mcr at sandelman.ca> wrote:

> Missing are error states.
> For instance, "starting" may well lead to an error state such as "failed
> to boot".  The VM may well be spinning cycles at "Kernel panic", "db>",
> or "Failure on Drive C, abort,retry,fail".  The failed state is
> important for clients to know, and possibly also for billing.
> Another state that I can think of that might be important is network
> disconnect --- you may have a VM that is ACTIVE, but the networks are
> disconnected. I'd call this state "STANDBY"
> (Or not yet connected).   I often do this in my virtualized
> infrastructure: bring up a VM with a new version of software, on a new
> IP, with VRRP/CARP configured, but I'm not going to connect it on the
> live side until it's confirmed to be up, at which point, I enable the
> networking, and it takes over the virtual IP.

Randy Bias, VP Technology Strategy, GoGrid
randyb at gogrid.com, (415) 939-8507 [mobile]
BLOG: http://neotactics.com/blog, TWITTER: twitter.com/randybias

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