>>
A customer (mildly) complained thatsome of our product allocations still
use
BLKSIZE=3120. I vaguely remember trying to change all of them to
BLKSIZE=0 many years ago (probably before OS/390) and running into some
issues with certain IBM utilities. Unfortunately, I can't remember the
specifics.
In starting to revisit this again, I noticed numerousoccurrences of '3120'
in IBM help and documentation. For example, the TSO/E RECEIVE command HELP
claims that the log data set must be BLKSIZE=3120:
<TSO/E RECEIVE command HELP>
LOGDATASET You may specify an alternate data set to be
used for the logging of the transmitted data.
This data set will be created if it does not
exist. The data set should be created with
a logical record length of 255, a record format
of VB and a blocksize of 3120.
...
LOGDSNAME You may specify an alternate data set to be
used for the logging of the transmitted data.
This data set will be created if it does not
exist. The data set should be created with
a logical record length of 255, a record format
of VB and a blocksize of 3120.
</TSO/E RECEIVE command HELP>
Is this just outdated help? Or does this restriction still exist?
>>
I looked at the current TRANSMIT/RECEIVE code, and it still
specifies BLKSIZE=3120 when it creates a LOG data set, and still
hardcodes BLKSIZE=3120 on its DCB for the log data set. I engaged
in battle with the former TSO developers a long time ago (maybe over
20 years ago, maybe even before the advent of System Determined
Blocksize). I wanted them to at least remove the BLKSIZE=3120
on the DCB so that if someone (like me) was sensible enough
to allocate his own log dataset with an efficient BLKSIZE,
TRANSMIT/RECEIVE would cease to override that on the DCB and thus
no longer change the BLKSIZE to 3120. Since the stupid DCB
specification is still there, exists, I apparently lost that battle.
Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY
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