On Fri, 27 Mar 2009 14:54:51 -0400, Bill Fairchild <[email protected]> wrote:
>... >In 1982 I attended a SHARE session in New Orleans in which the IBM presenter said that he had surveyed a huge number of data sets in an internal IBM development data center, and had found that the single most commonly used block size was 80 bytes. Presumably many of these people had been developing mainframe code since the early 1960s when S/360 began being built. >... It would be nice if such things were in the distant past. As recently as 5 years ago I say some Program Directories specifying block sizes of 3120 and 6144. Worse yet, just a few weeks ago we were told to allocate a trace dataset (for an IBM product) with RECFM VB, LRECL 1024, and BLKSIZE 6144. (Obviously the product's own flavor of trace; not GTF or CTRACE.) 6144! This came from the product's lvl2 support team. Did they know that this was needed for a very poorly written trace furntion? Or did they just pick a cherished (now thoroughly meaningless) blksize from the distant past? Either way, it did not inspire confidence. Pat O'Keefe ---------------------------------------------------------------------- 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
