1/2 track blocking factor, so 2 blocks per track in actual usage. 1 cyl = 15 tracks or 30 blocks, so allocation units are in cylinders. 240 blocks is 120 tracks is 8 cylinders, so looks like it did a release. Blksize of 1-22 bytes occurs 86 per track. 10,000 / 86 = 116.27 tracks, rounded up to cylinder boundary of 120 track. 300 blocks secondary is 4 tracks rounded up to 1 cylinder.
http://bitsavers.trailing-edge.com/pdf/ibm/dasd/reference_summary/GX26-4577-0_3390_Reference_Summary_Jun89.pdf On Fri, Aug 29, 2014 at 5:47 PM, Paul Gilmartin <0000000433f07816-dmarc-requ...@listserv.ua.edu> wrote: > My command was (after deleting the output data set): > > _UNIX03=NO cp -B -P'SPACE=(10000,(0,300)),BLKSIZE=0' /dev/fd/0 > //TEMP.CBT854.ZIP > > ISPF DSLIST Information tells me: > > Data Set Information > > Data Set Name . . . . : user.TEMP.CBT854.ZIP > > General Data Current Allocation > Management class . . : **None** Allocated blocks . : 240 > Storage class . . . : **None** Allocated extents . : 2 > Volume serial . . . : 000000 > Device type . . . . : 3390 > Data class . . . . . : **None** > Organization . . . : PS Current Utilization > Record format . . . : VB Used blocks . . . . : 211 > Record length . . . : 1028 Used extents . . . : 2 > Block size . . . . : 27998 > 1st extent blocks . : 120 > Secondary blocks . : 300 Dates > Data set name type : Creation date . . . : 2014/08/29 > SMS Compressible. . : NO Referenced date . . : 2014/08/29 > Expiration date . . : ***None*** > > OK. I understand the "27998". That's SDB doing what it should. > > Where does the "120" come from? Where does the "240" come from? How > is the "10000" I coded reflected in the Info display? Did the C RTL > second guess me? Is this the 3390-pretending-to-be-a-3380? Does Info > show that if so? Are the Primary, Secondary, Allocated, and Used > in units of 10000 or 27998 or other? How can I tell? > > I can never get my head around this stuff. > > -- gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
