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Different drives in Raid 5?

Last response: in Storage
February 28, 2013 5:02:09 AM

Hi guys. Quick question. I have a raid 5 with five 1TB RE4. I wanted to get an additional couple TBs. Can I buy a 2TB RE4 and stick it in my raid? I don't mind rebuilding the raid (everything is backed up). So is it possible (and stable) to run different size drives in a raid 5? thanks!

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Best solution

February 28, 2013 6:32:38 AM

any drives will work together but they all need to be the same size
February 28, 2013 7:40:53 AM

Great thanks! I'll just buy two 1tb drives then. Appreciate it!
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February 28, 2013 3:48:12 PM

Best answer selected by thermocoffee.
a c 740 G Storage
February 28, 2013 10:58:37 PM

The 2 tb drive will work but only 1 tb of the drive will be used and you will have no access to the other 1tb on the drive. Raids can only use the size of the smallest drive to build with. ie a 10mb drive and a 10tb drive in raid0 will create a 20mb raid0 (2*10mb) . In your case your smallest drive is 1tb.

The formula to calculate the size of a raid5 is (N-1)*Smin where N is the number of drives and Smin is the size of the smallest drive.