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Need help about specifying Block size

 
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amitjain231

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Joined: 04 Mar 2005
Posts: 8
Location: asd

PostPosted: Thu Apr 07, 2005 9:45 pm    Post subject: Need help about specifying Block size
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Can u help me when we specify BLKSIZE = 0 in JCL.
Any Significance?
:)
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priya

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Joined: 24 Jul 2003
Posts: 568
Location: Bangalore

PostPosted: Thu Apr 07, 2005 10:14 pm    Post subject:
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Try this Post:

http://www.ibmmainframes.com/viewtopic.php?t=1569
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superk

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Joined: 26 Apr 2004
Posts: 4648
Location: Raleigh, NC, USA

PostPosted: Thu Apr 07, 2005 11:10 pm    Post subject: Re: Need help about specifying Block size
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See this page from the "z/OS v1R6.0 DFSMS: Using Data Sets" manual:

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DGT2D430/3.2.3.1.2?DT=20040624112123#HDRSYS

Quote:

DASD Data Sets: When you create (allocate space for) a new DASD data set, the system derives the optimum block size and saves it in the data set label if all of the following are true:

- Block size is not available or specified from any source. BLKSIZE=0 can be specified.

- You specify LRECL or it is in the data class. The data set does not have to be SMS managed.

- You specify RECFM or it is in the data class. It must be fixed or variable.

- You specify DSORG as PS or PO or you omit DSORG and it is PS or PO in the data class.

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