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Status Not under consideration
Workspace Storage Scale (formerly known as GPFS)
Created by Guest
Created on Jul 6, 2023

RELATED IDEAS

prevent uneccessary recalls / improve DMAPI support with snapshots

[ this an an idea for the DMAPI part of GPFS when working with Spectrum Protect for Space Management ]

We suggest to improve the DMAPI handling code in GPFS to detect when premigrated files that are part of a snapshot and the orignal files is migrated. The original file's content should remain on disk and be linked it to the snapshotted file. This would greatly reduce the number of required recalls in certain situations:

  • access to the snapshotted file will no longer trigger a recall

  • deletion/overwrite of the original file will no longer trigger a recall


Idea priority High
  • Admin
    THOMAS O'BRIEN
    Reply
    |     Aug 31, 2023

    Thank you for submitting this enhancement request. We do have some work in progress to eliminate DMAPI “recall storms” from concurrent stub file deletions with snapshot and this enhancement should reduce recalls needed on file deletion, but not in the way it described in your request.

  • Guest
    Reply
    |     Jul 6, 2023

    Thinking more about the current implemntation leaves me with an unpleasent feeling because there's a time gap (e.g. between the migration and the transparent recall on overwrite of the original/migrated file) where the disk space is freed. So theoretically it can happen that during that time gap the disk gets filled up by other tasks and the recall cannot be done anymore. In that case one's left with a broken snapshot. This situation would completely vanish with the proposed idea, too.


    Also we have a reversal of the filesystem behaviour compared to non-HSM gpfs filesystems. On a non-HSM fs deleting the original file will not free any space as long as there's at least one snapshot. On an HSM fs deleting the original file will instead increase disk usage. This difference would also vanish with the proposed idea.

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