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Status Future consideration
Created by Guest
Created on Mar 12, 2020

Need a support for data migration using AFM between two Spectrum Scale clusters with migrated data to tape by ISP HSM.

Currently data on a source Spectrum Scale clucster(or ESS) can be migrated to a target cluster using AFM prefetch function.
In case that a cluster uses HSM function which migrates data on GPFS to tape storage using ISP for Space Management, AFM provides a function to prefetch only stub file so that the data on tape NOT to be recalled to GPFS, and they are copied to the target cluster.
Since the customer wants to use the current tape storage for their new target cluster, they need this AFM prefetch function in this environment to migrate the data to the target cluster.
The issue here is that the files migrated from the source cluster to the new are marked as "expired" by DSM component of ISP for Space Management when dsmreconcileGPFS command is executed in order to perform reconcilation between GPFS and tape storage. The files marked as "expired" are the ones only whose metadata are copied to the target using AFM prefetch function explained above.
Even though the files are marked as "expired", they can be still recalled from the Tape System and accessed on the target cluster without any problem.
So the request is to improve the reconcile function of ISP for Space Management not to regard those files as "expired". This issue was once reported as a case, TS003440237, but this case was rejected because the development team thought this was not a problem of the product, but a new feature.

Idea priority Urgent
  • Guest
    Mar 16, 2020

    This request may not be delivered within the release currently under development, but the theme is aligned with the current multi-year strategy. IBM may consider and evaluate any RFE Community feedback for this request through activities such as voting. IBM will update this request in the future.