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Status Not under consideration
Workspace IBM i
Categories Storage
Created by Guest
Created on Dec 2, 2020

Support n-way DASD mirroring

We would like to be able to mirror storage across more than two physical DASD units per logical storage unit.

Use Case:

Mirroring currently only supports two DASD units, so it only has protection against a single DASD device failure in the pair. While the probability of the mirrored unit failing is low, the rebuild process puts extreme load on the remaining unit and can take a very long time with large modern drives. Maintenance to IOAs or expansion EMMs can also cause a loss of mirroring across a large number of units at once, increase exposure to a failure.

While RAID-6 supports two-drive redundancy, RAID is not an acceptable solution to our organization as we have had several instances in the past where an IOA, expansion frame, or even a single failed DASD unit has prevented access to the entire array, resulting in a system halt and/or corrupted data..

Idea priority Medium
  • Guest
    Apr 24, 2024
    At this time we have chosen not to implement this in a near term release.