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Status Future consideration
Workspace z/OS
Categories DFSMS SMS
Created by Guest
Created on Sep 14, 2021

RELATED IDEAS

EAV impacting Overflow storage group usage

Due to the introduction of EAV volumes in our environment, the number of volumes in our primary storage groups will be reduced such that the number of volumes in the overflow pool can have more than the number of volumes requested for an allocation. Currently, when using an Overflow storage group and the number of volumes requested is greater than the number of volumes in the primary storage group, the volumes in the primary storage group are put on the tertiary volume list. The overflow volumes are placed on the secondary list therefore the allocation has been going to the overflow storage group even though there is sufficient space in the primary storage group for the request.

Idea priority Medium
  • Guest
    Reply
    |     Oct 5, 2021

    I agree with your solution to this RFE. That should work well for us. Thank you.

  • Guest
    Reply
    |     Sep 24, 2021

    Due to the concern about number of extents per volume a data set can have and about the potential space the data set needs to be extended, SMS will still attempt to preserve number of candidate volumes in Catalog for a data set. Therefore, to satisfy this RFE, SMS will enhance the behavior of Extend Storage Group Name attribute in a storage group definition as follows:

    During initial non-striped, non-Guaranteed Space allocation, when the number of volumes in an enabled (primary) storage group is less than the number of volumes requested, volumes in the enabled (primary) storage group are not marked for the tertiary list if all the following conditions are met:
    1. The enabled (primary) storage group has an extend storage group name specified.
    2. The difference between the number of volumes in the enabled (primary) storage group and the number of volumes requested can be covered by the number of volumes in the extend storage group.
    3. The primary requested space can be satisfied in the enabled (primary) storage group.

    If all the above conditions are met, the data set allocation will be attempted in the enabled (primary) storage group.
    The data set volume count is still preserved and stored in Catalog as requested.
    Volumes in Overflow and Extend storage groups are still not eligible for the primary list.

    Note: If all volumes in the enabled (primary) storage group are EAV, USEEAV(YES) in SYS1.PARMLIB(IGDSMSxx) is still expected for SMS to be able to select EAV volumes.

    Please provide the feedback for our proposed solution.

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