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The Setup

  • I have 2 x 1TB drives in a RAID1 configuration.
  • One of the hard drives has failed and so my RAID situation is degraded.
  • All data is backed up via Backblaze as well so I'm not worried about losing it.

The Goal

  • I'd like to upgrade while I'm replacing, to buy a 2 TB or 3TB drive, hook that up to the Raid 1, and then replace the working 1 TB drive with another 2 TB or 3TB drive when it eventually breaks.

The Question

Is this an alright idea (assuming I don't plan to hit the 1 TB threshold anytime soon), and does Intel RST allow for this? I'd like to know before I go spend my money.

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up vote 2 down vote accepted

Yes, you can replace the drive with a larger one, but you can't use the higher capacity until you replace the other drive as well. I'd recommend doing the upgrade all at once.

  • Break the RAID (so that the drive is a single disk)
  • Copy the data to the new drive (Ghost, Acronis Disk Image etc.)
  • Expand the partition
  • Replace the other drive
  • Rebuild the RAID1 from the copied data
share|improve this answer
Great, that's exactly what I was looking for. Just to clarify: are you recommending cloning the drive so that the raid doesn't tax itself trying to synchronize the drives? – SeanKilleen Oct 9 '13 at 10:51
@goober The main point of cloning instead of rebuilding the RAID is the speed: usually RAID rebuilding has a lower priority, so the copying is done slower. When copying with an application it's done in the foreground with high priority, so the process goes faster. – onik Oct 9 '13 at 10:57
Makes sense. Thanks! – SeanKilleen Oct 9 '13 at 11:58

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