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Status Future consideration
Workspace IBM Spectrum Virtualize / FlashSystem
Created by Guest
Created on Jan 17, 2020

RELATED IDEAS

Expand and reduce DRAID / RAID

We should be able to grow or shrink an existing RAID by any rational number of disks.

At each operation, there would have to be data movement and array rebuilds. Relocate the first chunk, then rebuild those stripes based on the new geometry (and rebuild areas if DRAID). Then, fill the rebuilt chunk with extents from what would be the next chunk, and overflow going wherever. Then repeat until all of the used chunks are moved to new-geometry areas. If thin or compressed volumes exist, then continue until 15% additional free space is converted if DRP, or 5% if traditional. Then free the removed disks, marking their header as unused. Then finish with the array format/rebuild. This would require a state map, which could be a hidden vdisk at the end of the array.

Because the chunks would be effectively a new mdisk on the same disk, it would also be possible to reshape such that the new array had a different RAID level, as long as the data fits in the new geometry.

Idea priority Medium
  • Guest
    Reply
    |     Sep 5, 2021

    Added duplicate request 150044 for increase stripe width when expanding DRAID

  • Guest
    Reply
    |     Sep 28, 2020

    DRAID expansion was delivered in 1Q20 release 8.3.1

    Keeping this RFE open for shrinking or changing geometry.

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