After an upgrade to R19 release a different LRECL and BLKSIZE is seen for the unload (SYSRECnn) datasets.
Now (using R19's Fast unload for DB2 for z/os) RECFM = VB LRECL=32756 BLKSIZE=32760
whereas before (in R17 release) LRECL used to be 224
The default output record length is now 32,756 bytes for a comma delimited unload. If a different length is required, specify LRECL-USER YES in the hlq.CDBAPARM(PFU) member. Also in the JCL specify an LRECL value in the SYSREC data set allocations.
In the PFU member(if not there already)...add this line. Create the member if not there.
This line can also be added in SYSIN in the CA Fast Unload parms of the JCL.
See this documentation reference: