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Status Not under consideration
Workspace z/OS
Categories DFSMS DSS
Created by Guest
Created on Mar 12, 2024

RELATED IDEAS

Adding a message in SPACEREL on spaced freed after releasing extents.

In preparation for Global Mirror and Thin Provisioned volumes in DS8950F Storage Manager we need to run SPACEREL on all available LPARS, so after running a few weeks we noticed that the messages are not really useful at determining freed space. Currently we are triggering only from the ADR523I (001)-SRFP (01), SPACEREL FOR VOLUME ??????? HAS COMPLETED which technically is not enough information in a batch job to identify how well we are doing freeing up extents and freed space. Consider this needed update.

Idea priority Urgent
  • Guest
    Reply
    |     May 16, 2024
    Thank you for submitting your idea.

    The SPACERELEASE operation is designed to determine all free-space extents on the volume and request that they be freed. The extent that describes each free space area on a volume may or not align with physically backed storage. If it is backed by physical storage, the extent may or may not include at least 1 full ESE physical extent to be freed. When the requested freed extents does align with 1+ ESE physical extent the operation is performed asynchronously in the storage hardware. They determine if and when space can be freed. Due to this delay, it is not possible to have DFSMSdss report if space was physically freed or not. Instead other tooling is provided to query the storage pool.

    Therefore, due to the design of ESE, we are unable to provide additional support at this time.

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