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Status Not under consideration
Workspace IBM i
Categories Storage
Created by Guest
Created on Aug 22, 2017

Support 3-way (or n-way) DASD mirroring

We would like to be able to mirror DASD units across 3 (or more) physical devices, instead of just two.


Use Case:

Mirroring as it current exists only has protection against a single DASD device failure. 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.


Idea priority Medium
  • Guest
    Dec 2, 2020

    It means it did not make the cut for the next release. If you formally want it considered again, you should submit it again. Disk technology is constantly changing and different ideas are always being considered but RFEs do help in the prioritization conversations. It should not be set for 50 years, I will check into that.

  • Guest
    Oct 23, 2020

    Does this response of "Declined" mean it is being deferred to a future release, or remove from consideration entirely? Should I submit a new RFE to have this be considered for a future release?

    I see the reconsideration tab says it cannot be reconsidered for 600 months == 50 years?!

    Also - why doesn't the RFE system send any sort of email notification when these requests are updated?!

  • Guest
    Sep 29, 2020

    Thank you for your feature request. While this is a valid request, it did not make the cut for new features coming out next release.

  • Guest
    Jan 18, 2019

    Recent issues that continue to support this request:

    PMR 69220,082,000: A defective DASD unit was causing two IOA to be entirely unresponsive to the OS, reporting as "Occupied" in the Packaging Hardware Resources section of the DST/SST Hardware Service Manager with no actual errors being logged from the IOA or attached devices. This resulted in two 5887 drawers / 23 units on the System ASP being inaccessible to the OS. We were able to IPL, but were unprotected until we could locate and identify the failed unit -- 3+ way mirroring would have left us protected. (If we had been using any flavor of RAID, this would have made it impossible to IPL our system!)

    PMR 69313,082,000: An intermittent 5887 ESM failure required powering off the IOAs to exchange the unit. We were exposed without protection on 28 units for several hours during the repair and subsequent resume operations, 3+ way mirroring would have kept us protected during this repair.