On 6/10/2013 11:38 AM, Farley, Peter x23353 wrote:
<Rant> Like a few others on this list, I have often gritted my teeth at the necessity to estimate disk storage quantities that vary widely over time in a fixed manner (i.e., SPACE in JCL) when the true need is just to match output volume to input volume each day.
If it's that predictable, it's trivial to write code to produce an estimated output volume from input, and tailor and submit the appropriate JCL. So that's a non-issue.
EAV or not EAV, guaranteed space or not, candidate volumes, striped or not striped, compressed or not compressed - all of that baggage is clearly non-optimal for getting the job done in a timely manner. Why should allocating a simple sequential file require a team of "Storage Administration" experts to accomplish effectively? </Rant>
There is no theoretical solution. On any system running jobs, it is possible for one job to monopolize available space, requiring other jobs to wait forever or be terminated. Even on a single job system that job may exhaust space. Requiring a space specification may be a PITA, but it guarantees that a started job will finish (subject to other constraints). And the SA experts, especially for sequential files, can be avoided with simple estimator programs.
This seems to be more of a religious war than a practical discussion. Gerhard Postpischil Bradford, Vermont ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
