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What should my storage size be with my RAID 5 configuration?

Posted on 2007-07-21
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I have a basic understating of how various levels of RAID's work.  I have a server that has 3 HD's, 36GB Each and they are configured in a RAID 5 Array.  My question is, in my computer how come the available space is 69GB?  I was under the impression my available storage ability should be the size of my smallest drive.  Thanks in advance.
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Question by:GTKINC
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Christopher McKay earned 2000 total points
ID: 19540759
RAID 5 stripes the data across the drives, and uses  one of the drives for a parity.

This means that with the 3 drives you are using, 1 of them is used for the parity bit, and the other two make up the size of the available space, so 36GB X 2 = 72GB. (Formatted etc, would be around 69GB, as your shows.

To learn more about RAID 5, read here:

http://www.acnc.com/04_01_05.html

Hope this helps!

:o)

Bartender_1
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by:GTKINC
ID: 19540777
Keeping the above in mind though if one fails then i'm still up and running, correct?  Obviously it would need to be replaced ASAP.
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by:Christopher McKay
ID: 19540787
That's correct, the RAID will continue to function, and once the drive is replaced, the RAID should automatically rebuild it. Keep in mind that you will have to replace the drive with the same size or larger drive.
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by:GTKINC
ID: 19540803
Makes perfect sense.  What if I have 7 drives in my Array, would my storage capability add up to the combined capacity of 6 drives?
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by:Christopher McKay
ID: 19540819
Yes, that's the idea, the volume size would be (The size of the smallest drive)* (the total number drives -1)
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by:GTKINC
ID: 19540827
Thanks a bunch.
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by:Christopher McKay
ID: 19540835
Thanks for the points!

Glad I was able to help.

Cheers!

:o)

Bartender_1
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