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It's always better to mirror disks first

This is a Q&A from SAN School Lesson 2.
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What do you call the first mirror disks and stripe that's on top of them? (Does it give us more flexibility at disk failure time)?

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What you are suggesting is called RAID 1+0, or RAID10 (raid ten) for short. It is always better to mirror disks first and then do striping, rather than create a mirrored stripe set. If you stripe first and then mirror and you lose a drive, the entire stripe set is disabled. If you mirror two disks at a time and then stripe, you can survive multiple disk failures.

Chris

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This was first published in February 2004

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