On Sun, 15 Jan 2017 08:12:53 -0500, Bill Ashton wrote:
>For fun I created some files. It seems that files with LRECL=7000 through
>10796 create a SDB BLKSZ equal to the LRECL, rather than half track
>blocking. ...
>
You missed at least one:
Organization . . . : PS Current Utilization
Record format . . . : FB Used tracks . . . . : 0
Record length . . . : 9226 Used extents . . . : 0
Block size . . . . : 27678
My search was assisted by the table at:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/am3u1001/B.1.2
Title: Using IBM 3390 in an MVS Environment
Document Number: GC26-4574-03
B.1.2 Using the 3390 Track Capacity Table (Without Keys)
Pondering this, it occurs to me that given 3390 track size and RECFM=FB, SDB
will always select a BLKSIZE that gives either a prime number of blocks per
track
or one block per track.
-- gil
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