Gerhard and Lionel, How much wasted space is there in the blocks or blksize, slack bytes was the old name many moons ago
Scott ford www.identityforge.com from my IPAD 'Infinite wisdom through infinite means' > On Dec 6, 2013, at 3:30 PM, Gerhard Postpischil <[email protected]> wrote: > >> On 12/6/2013 1:41 PM, Dyck, Lionel wrote: >> Which is better - a BLKSIZE of 3120 with 100 members ranging from 3 >> to 30 records or that same set of records in a PDS with BLKSIZE of >> 27920. And similarly what about a PDS with BLKSIZE of 3120 and 100 >> members ranging from 300 to 9000 records compared to the same set of >> records in a PDS with a BLKSIZE of 27920. > > I just ran a test on my macro and source libraries. Each has 80 used > directory blocks. > > MACLIB 98 tks with 3120 94 tks with 27920 > SOURCE 829 tks with 3120 442 tks with 27920 > > In practice I've found the optimal block size to be close to half track, with > one exception (either 3K or 7K record size?), where five block per track > actually gave better usage. > > Gerhard Postpischil > Bradford, Vermont > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
