jn:
https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.4.0/com.ibm.zos.v2r4.hasc300/has2z1_Use_of_unblocked_records_for_SYSIN_and_SYSOUT_data_sets.htm
You should not block SYSIN and SYSOUT data sets because the SAM
(sequential access method) compatibility interface will increase overhead
by unnecessarily deblocking and blocking data sets.
I didn't know that. Should I have RTFM?
Is SDB aware of that?
If BSAM, is this offset by more calls to WRITE/READ?
BLKSIZE is incompatible with DD */DATA, perhaps because
the programmer is expected to use F/V rather than FB/VB
-- gil
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