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I know this question is stupid. As far as I can see, RAID 0 is a way to combine multiple hard disks as one without any redundancy. But a hardware manual recommends SSD RAID 0 configuration, and we have just single 512GB SSD. So I need to clear things out.

Do I need to make it a single disk RAID 0 here? If so, what's any advantage using single disk RAID 0?

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closed as not a real question by Xavierjazz, Dave M, wizlog, 8088, Tanner Feb 20 '13 at 23:57

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Which hardware manual? –  Dan D. Feb 20 '13 at 21:24

5 Answers 5

up vote 13 down vote accepted

As far as I can see, RAID 0 is a way to combine multiple hard disks as one without any redundancy.

Correct. RAID 0 (stripe) has at least two implementations. One of them just appends disks, making multiple disks act as one big drive. One which alternates sectors between drives, allowing up to double performance with two drives.

With a single disk there are very few reasons to use RAID.

That does not mean that you can not set up RAID with a single disk, e.g when:

  • You set it up as a mirror with missing second device. (Presumably because you want to add one later and just let things sync without setting up a new configuration).
  • You want experiment with disk layouts. (No performance is gained, only complexity is increased).
  • Or you want to remain an identical setup with other computer (e.g. with Dell Lattitude E-series laptops which for some reason come with the BIOS set to RAID mode and a single drive. I am not sure what the people smoked before deciding on that. Maybe it was marketing which wanted to be able to use the term RAID).

Having said that, I see no sane reason to use a single disk in RAID mode. Use any modern SSD with the normal AHCI mode. Not in ancient IDE mode, and not in IRST mode.

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Single disk RAID makes no real sense. The sole name RAID gives the first clue: REDUNDANT ARRAY of Inexpensive Disks

You cannot have redundancy, much less an array, with only one disk

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RAID0 never provides redundancy. And there are arrays of size 1 in computer science, as well as Mathematics. –  Dennis Feb 20 '13 at 18:51
    
For your information: Wikipedia says that “RAID” has come to mean redundant array of independent disks. For my information, when you refer to a “sole name,” do you mean only name, bottom of the foot, or a fish similar to flounder? –  Scott Feb 20 '13 at 23:37

RAID needs two or more disks, if you have just one its nonsense to make it RAID.

You can achieve a good performance if you use AHCI controles instead of IDE for your SSD.

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You need at least two disks for RAID0. RAID0 with a single disk is not possible.

You can create two logical disks on a single physical disk and combine those in RAID0, but that has no advantages whatsoever.

RAID0 benefits (or is supposed to) form the combined throughput of all involved disks. With a logical disks on the same physical disk, the performance benefit is gone. Due to the overhead of RAID0, all operations will actually become slower.

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If you're talking about two logical drives on a single physical drive running RAID 0 on the logical drives(or a similar setup), the result is likely to be wearing out the ssd faster, because for every operation there will be two operations on the same physical drive, and also RAID is typically for physical redundancy, which you won't have.

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