Understanding availability

["Considine, Toby (Campus Services IT)" <Toby.Considine@unc.edu>]

Assume a fixed have a sequence with a ramp up, a run, and a ramp down. The handle of the sequence points to the Run Time

 

15M

1Hç= (handle)

15M

 

We need rules about what availability means. Here are mine.

 

1)      Availability (as far as start) refers to the indicated interval only. If the availability begins at 9:00, then it is acceptable to receive a request at 9:00 (rather than at 9:15). Intervals before the Indicated Interval must be ignored for availability. (Principle of Minimal Knowledge).

2)      I want to say the indicated Interval must fit w/I the Availability. If the availability ends at 11:00, then a start time as late as 10:00 is acceptable. Let’s look at another case

 

15M

()ç= (handle)

15M

 

3)      In this case the invoker must specifies Start and Run Time (duration). If the availability is (9:00 to 11:00), then (9:00 – 1H) , (10:00 – 1H) (9:30 – 1H15M) are all acceptable. (10:00 – 2H) is not.

 

These rules feel pretty good for one scheduled interval. Let me try to break them:

 

1Hç= (handle)

1H

1H

1H

1H

1H

1H

1H

1H

1H

1H

1H

 

Here we have 12 consecutive 1 hour intervals. This might be a schedule of prices. Availability does not seem as important with this, which is publishing prices, that may not have negotiable start times. Still, an availability of 9-10, for the 12 hours from 9-9 seems a little odd. I think I can live with it, though.

 

Comments?

 

tc

 

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"If something is not worth doing, it`s not worth doing well"
Peter Drucker

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Toby Considine Chair, OASIS oBIX Technical Committee U.S. National Inst. of Standards and Tech. Smart Grid Architecture Committee Facilities Technology Office University of North Carolina Chapel Hill, NC

Email: Toby.Considine@ unc.edu Phone: (919)962-9073 http://www.oasis-open.org blog: www.NewDaedalus.com