David W. O'Brien wrote: > So a Linear dataset will have a Cisize that is a > multiple of 4096, not an absolute value of 4096.
You are correct. I was assuming that nobody had (and the original poster had NOT) done anything really inappropriate. For any CISIZE past 16KB you get into diminishing returns on a 3390, capacity-wise. There is almost never any good reason to specify a CISIZE for a LINEAR data set other than 4 KB, especially not when used how they were originally intended to be used: with DIV. Assuming a random access pattern, they work much better, quite a bit more efficiently, meaning less I/O and substantially less CPU, with a 4 KB CISIZE (at least according to my own artificial benchmarks - YMMV). So, I'll revise my statement to be more academically correct: There are exactly 180 4K blocks (CIs) in each 3390 CYL. All LINEAR cluster space allocation calculations SHOULD be able to be made knowing just that (unless you have, in ignorance, set an inappropriate, inefficient CISIZE, which is usually any value greater than 4 KB, and most certainly anything greater than 16 KB). -- WB ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
