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Status Not under consideration
Workspace z/OS
Categories BCP_Supervisor
Created by Guest
Created on Feb 8, 2024

RELATED IDEAS

Error message to be produced when LNKLST concatenation datasets experiencing severe performance degradation, especially Sys1.LINKLIB.

This will indicate that there is a problem with LNKLST concatenated datasets, and that LNKLST is is under performance degradation constraints, when datasets were removed and added back to the LNKLST concatenation.
Current error messages for LNKLST did not indicate any problems with LNKLST.

Idea priority Urgent
  • Guest
    Reply
    |     Mar 5, 2024
    .z/OS does not track the performance of fetches from a data set, whether that data set be part of the LNKLST or not. I believe from the Case that the real problem was that the LNKLST as a whole was not being managed by the Library LookAside (LLA), after some unsupported operations were performed. As a result the retrieval of a module's directory entry was done using I/O to the dataset rather than in-storage retrieval for every module fetch from the LNKLST. You might consider submitting a request for a message informing if LLA is or is not managing the current LNKLST set as an entity (or that that state has changed from managing to not managing) since it is managing as an entity that allows avoiding some I/O to the dataset. Or you might be able to tell from monitoring programs such as RMF that unexpected I/O is occurring.

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