On 12/6/2013 3:48 PM, Paul Gilmartin wrote:
I don't believe the usual access methods will ever write blocks containing unused space (perhaps null segments with RECFM=VBS?) But since track balancing is not routinely performed except by Binder, there's likely to be an average of BLKSIZE/2 unused space at the end of each track.
I just relinked all of a load module library, and for a block size of 6160 it used 153 tracks, versus 149 tracks for 27998 size. Most of the blocks are control records <= 256 bytes.
But for the common card format libraries, there seems to be relatively little waste despite large blocks sizes.
Gerhard Postpischil Bradford, Vermont ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
