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Status Not under consideration
Workspace IBM i
Categories Storage
Created by Guest
Created on Sep 16, 2018

RAID Conversion Function in Storage Manager

Changing RAID Level or RAID Protection Hot Spare level requires all RAID protection to be stopped and restarted.

This is a long running process and leaves the system vulnerable to a single disk failure during the process.

This is exacerbated by the fact that both the stop and start RAID processes stress the disks and so are more likely to cause a disk failure on disk units being converted


Use Case:

Add function in the storage manager to allow change to raid level.
E.g. Migrate from RAID5 to RAID6 without stopping RAID5 first.

Additional Request:
During the Discussion with CEAC the idea that this function could also be used to re-balance the RAID stripes in an existing RAID set.

This would address a common scenario where a client buys a server with a RAID array active, then adds additional disks at a later time creating additional array(s).

For Example. A client purchases a server with eight disks configured in a single eight disk RAID5 array. At some point in the future they need more storage so add another four disks in a second array. They now have two RAID arrays, one containing eight disks and the other with four. This tool could be used to re-balance the arrays either making two arrays of six disks, one array of twelve or even three arrays of four. By doing so they would avoid potential disk imbalances and resulting poor I/O performance.


Idea priority Low
  • Guest
    Apr 10, 2020

    Currently no plans to implement this feature in the short term.

  • Guest
    Sep 17, 2018

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - Power Systems
    Product - IBM i
    Component - Storage
    Operating system - IBM i
    Source - None

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - Power Systems
    Product - IBM i
    Component - Core OS
    Operating system - IBM i
    Source - None

  • Guest
    Sep 17, 2018

    The COMMON Europe Advisory Council (CEAC) has reviewed this requirement and recommends that IBM view this as a “nice to have”low priority feature.

    Background: The CEAC members have a broad range of experience in working with small and medium-sized IBM i customers. CEAC has a crucial role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community and has therefore reviewed your RFE.

    To find out how CEAC help to shape the future of IBM i, see CEAC @ ibm.biz/BdYSYj and the article "The Five Hottest IBM i RFEs Of The Quarter" at ibm.biz/BdYSZT

    Therese Eaton – CEAC Program Manager, IBM