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Our group has a 16 disk backup RAID6 array. Currently, those 16 disks have the following specs;

  • 500 GB
  • 16 and 64MB cache
  • 3 Gb/s SATA

I would like to begin upgrading these disks if possible, primarily for storage. In a perfect world I would be able to swap out older disks with a similar setup but much greater storage, e.g.

  • 2 TB
  • 64MB cache
  • 3 Gb/s SATA (the write speed is not a big deal as writing occurs pretty infrequently)

However, I guess that having different sizes drives in a RAID array is a bad idea, so does anyone have an suggestions on how to proceed?

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  • You would have to partition the 2TB drives in 500GB chunks.
    – nopcorn
    Commented Jun 22, 2013 at 19:25
  • @MaxMackie You seen, I was thinking about that, but would that work with hardware RAID? The disk still has a single point of access to the RAID controller, but the disk controller would have to provide access to the four partitions as if they were four separate drives - can it do that? Would that not also reduce the SATA speed to 0.75 Gb/s per partition or worse, actually?
    – Alex
    Commented Jun 22, 2013 at 19:42
  • Hmmm, good questions. Unfortunately I've never dealt with hardware RAID so I'm not too sure what would happen.
    – nopcorn
    Commented Jun 23, 2013 at 14:58

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