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Say I have a RAID 1 config of two 1TB drives. (1TB of storage)

I take one out, insert a 2TD drive and let it rebuild. (Still 1TB of storage)

Now I take the second one out, and insert a 2TB drive and let it rebuild.

Do I end up with 2 TB of available storage, or just 1TB, from the original configuration?

Does the answer change for RAID 5 or 6?

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closed as not a real question by Michael Hampton, Ward, HopelessN00b, EEAA, mdpc Nov 6 '12 at 17:03

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Yes. Try searching. Also please read the FAQ; we don't usually like hypothetical questions here. – Michael Hampton Sep 12 '12 at 9:46
Hey Michael. Thanks! That's a great tip! And it also doesn't make me feel dumb at all, because it never crossed my mind to search for the answer on the "internet". – Arielr Sep 12 '12 at 11:00
up vote 4 down vote accepted

No, you will end with the same storage space, and this doesn't change with R5 or R6.

However, you can increase the storage space afterwards, but this is a rather delicate procedure.

You need to

  • Enlarge the RAID partitions.
  • Tell the RAID driver to use the additional space.
  • Grow the filesystems

If you google it, I am sure you will find a lot of guides how to do this in detail.

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Hint: I oriented my answer around a software RAID, but it's not really different with a hardware RAID controller. – Sven Sep 12 '12 at 10:21

A logical disk (LUN) does not automatically increase in size. Depending on RAID controller you can increase the size, or create a second logical disk with 1TB of new storage.

The answer is the same for any RAID level.

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