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I would like to know the correct way to set up a software RAID array on an existing server. I have two brand new 3TB disks to use for the array.

Specifically, I want to set up a 3TB RAID 1 array, formatted to ext4, not using LVM. But a more general answer might help others with instructions from start to finish.

I have tried a number of guides:

I also found these resources:

The initial partitioning of the drives appears to be key; the last link above mentions this in detail, but the previous link seems to achieve the same result and is simpler.

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In order to use disks > 2TB you just need to make sure you create the initial partition table in GUID format (GPT) rather than the old MS-DOS (MBR) format. You can do that using the parted command line program (using mklabel gpt) or from gparted using the 'Select new partition table type' drop down menu. –  steeldriver Sep 26 '13 at 11:52
@steeldriver - Yes, GPT seems to be the trick. –  David Edwards Sep 26 '13 at 16:52
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1 Answer

LHN seems to have an excellent resource on the topic.

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Aside from just being a link rather than an answer to the question, the instructions in your LHN link are largely the same as the 2nd link in my question, and will not work for drives larger than 2TB. –  David Edwards Sep 26 '13 at 16:49
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