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Status Future consideration
Workspace z/OS
Categories DFSMS HSM
Created by Guest
Created on Jun 28, 2022

RELATED IDEAS

Add a possibility to limit the number of parallel tasks to prevent S878 ABENDing HSM STC

During recover of over 1000 datasets we increased the maximum recover tasks step by step to 12. Once we reached 12 HSM STC itself ABENDed because of a S878 because of a storage constraint below the line.

This is documented as works-as-designed: https://www.ibm.com/docs/en/zos/2.5.0?topic=spaces-storage-estimating-considerations

It should be possible that HSM could limit the number of tasks (for dump, restore, ..., everything where DSS is used) to prevent the documented S878 ABENDing HSM STC, as this is a very bad implementation. The result of the ABEND was, that we had unusable datasets and we had to clean them up manually and recovere the selected datasets again.

Idea priority Medium
  • Guest
    Reply
    |     Jun 28, 2022
    Added to our backlog. Please note that the recommended procedure to maximize DFSMShsm parallel tasks w/o having ABEND878s is to use SETSYS DSSXMMODE. With standard HSM processing, DSS is loaded into the HSM address space, so each DSS instance consumes a considerable amount of memory. To solve this, we recommend using the DSS CrossMemory Mode which starts a unique DSS Address Space for each of the major functions. Then, HSM sends to requests to the DSS address space. This significantly increases the number of concurrent threads that may be run. Please reach out to me with any questions (wilcock@us.ibm.com)

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