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Status Not under consideration
Workspace z/OS
Categories DFSMS Access Methods Non-Vsam
Created by Guest
Created on Sep 14, 2023

RELATED IDEAS

PDS with 4K directory blocks, Load module headers

Current PDS directories are 256 bytes with 8 byte key, so 38 blocks per 3390 track or 9.5K of data.  Allowing 4096 bytes with 8 byte key would allow 11 blocks per 3390 track or 44K of data.  

Current PDS directories only have full blocks until end of data, so adding or deleting a member name results in rewriting all block from point of change.  With a 4K block, you could default to using half a block, padding with low values, and after the last member name a high values entry.  When a block fills up (or empties), move entries to previous or next block to use half the total free space in each block.

Current load module header records allow blocking up to 256 bytes.  Blocking up to 4096 bytes would reduce the space needed for these records.

Current load module header records are very short and mixed in with object modules that have very large block sizes.  If header records were padded to 4K and object modules only used 4K blocks, then overwriting a deleted member with the same or fewer number of 4K blocks would be possible, instead of having to rewrite the entire library from the first unused area forward.

Idea priority Low
  • Guest
    Reply
    |     Nov 6, 2023
    With the emphasis on clients using PDSE?s which offer additional benefits over PDS?s, this requirement is unlikely to be given high enough priority to be placed into the product plan. If this is still a priority for you, please open a new requirement.

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