[occi-wg] OCCI MC - State Machine Diagram

Sam Johnston samj at samj.net
Thu Apr 23 17:51:45 CDT 2009

On 4/23/09, Randy Bias <randyb at gogrid.com> wrote:
> 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.


Sam on iPhone

> --Randy
> 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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