Re: Delete Records -File Re-org

[email@xxxxxxxxxxxxxxxxxxx (James W Kilgore)]

Rob,

This is something every 24/7/365 shop should use in their tool kit.

For the rest of the shops, the cost of down time for an idle machine is
$0.

Most, not all, of the shops I work with are shut down one day per week. 
During that day we RGZPFM, by key, the most active files, not to save
space, but to improve response time.

On the three day weekends (there's 8 per year) we RGZPFM the million+
record files for the same reason.

Rob Berendt wrote:
> 
> Yes, and what about the cost of downtime?  Perhaps you can use the following 
>equation:
> R=Run rate of the application.  Or estimate of cost of downtime in 
>Currency/Hour
> D=Length of downtime
> S=Cost of AS/400 storage.  Which in my experience is $0.60/meg
> R$/Hour  *  D Hours  *  meg/$0.60  =  meg
> So if your cost of downtime is $400/hour, and it took 3 hours to reorg your
> files, then you had better saved 2,000 meg or 2gig of dasd.  Otherwise your
> wasting your companies money that would have better spent buying DASD.
> Unless you dramatically increase response time.  And yes, there are formula's
> for response time.  IBM published a document years ago on the value of 
>response
> time.  Batch is easy.  If it makes a job that ties stuff up faster, than use
> your run rate.  For example, if a batch job now finishes in 15 minutes versus
> 30 minutes, and your run rate is $400/hour that you've saved the company $100
> in processing time.  BUT, if it takes 3 hours to reorg, and you only saved
> 500meg of dasd and you only run this batch job once in a blue moon, then
> you've cost the company:
> (3hours  *  $400/hour)  -  ($100 batch job)  -  (500 meg * $0.60/meg)
> = $1,200  -  $100  -  $300
> =  $800 of lost money
>
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