Per MVS/QuickRef 7.6
Syntax
BLKSIZE= {value}
{valueK}
{valueM}
{valueG}
Subparameter Definition
value
Specifies the maximum length, in bytes, of a block.
The number of bytes that you specify for BLKSIZE depends on the
device type and the record format for the data set. The maximum
is 32760 for DASD data sets and 2,147,483,648 for tape or DUMMY
data sets, except for data sets on magnetic tape with ISO/ANSI
version 3 labels, where the minimum value for BLKSIZE is 18 bytes
and the maximum is 2048 bytes. To allow a block size greater than
2048, use installation exit routine IFG0193G. Version 4 labels do
not have this restriction but is 2,760 for DASD, ISO/ANSI Version 4
tape labels, and other data sets.
Thank you and have a Terrific day!
Jonathan Goossen, DTM
ACT Mainframe Storage Group
Personal: 651-361-4541
Department Support Line: 651-361-5555
For help with communication and leadership skills checkout Woodwinds
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IBM Mainframe Discussion List <[email protected]> wrote on
02/12/2013 02:22:30 AM:
> From: Mike Wood <[email protected]>
> To: [email protected]
> Date: 02/12/2013 02:22 AM
> Subject: Re: blksize for ML2 migrated dataset via HSM
> Sent by: IBM Mainframe Discussion List <[email protected]>
>
> > I wonder where CA-1 picks up the extra data from.
>
> Further to my earlier answer about the DCBE ....
> It is possible that CA-1 picks the value up from the Tape Exits
> Parameters, Main parameter list. The TEPM, mapped by IFGTEP, created
> by O/C/EOV and passed to tape installation exits. If CA-1 does not
> use the installation exits interface it will have to crawl through
> the DCB to DCBE for cases where the LBI is used.
>
> There is a technote on the CBTtape http://www.cbttape.org/features/
> Technote-largeblk.htm
>
> Mike Wood
>
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