Why are some files allocated with BLKSIZE=32000?

Document ID : KB000094857
Last Modified Date : 07/05/2018
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Question:
In the installation JCL some files like the AABDDATV and CABDDATV libraries are allocated with a blocksize of 32,000. 
Considering the capacity of a 3390 track is 56,664 this is wasting a lot of DASD space.
Is there some restriction that prevents these files from having a more efficient block size?
Answer:
The block size for the AABDDATV and CABDDATV libraries do not need to be 32,000.
All future PAX files for CA Datacom products will be changed to use half-track blocking, 27,998.
You can change the install JCL to use BLKSIZE=27998.