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With my Dell Precision Workstation T7400 came a SAS controller that supports both striping and mirroring. Total nr of physical connections is 4. What I'd like to do is plugin four 2TB disks, select two of them for striping and the other two for the mirror of the first two.

I know, RAID-5 would be more suitable here, but that's not supported as far as I can tell. Is this a common scenario and should this be possible with my hardware and/or with a new controller card?

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Why is it that you think RAID5 would be more suitable? –  joeqwerty Aug 18 '10 at 13:06

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up vote 5 down vote accepted

This would be comonly known as RAID 1+0 or RAID 10.

Check whether your controller supports it ;) Being a SAS controller... it should.

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Otherwise known as "Nested RAID." See: en.wikipedia.org/wiki/Nested_RAID_levels –  Warner Aug 18 '10 at 14:06
    
Ah, that's what that RAID-10 is all about. Thanks! –  Abel Aug 18 '10 at 16:18
    
PS: as it turns out, Dell's SAS controller does not support RAID 10... :( –  Abel Sep 5 '10 at 16:50

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