# Network raid calculation on storevirtual P4330

I've 2 node of storevirtual P4330 with 8 disk of 900GB. Each storage by default comes with raid 5 and 1 logical array. I configured a network raid 10 for the storage.

according to the formula on this site: http://h20564.www2.hp.com/hpsc/doc/public/display?docId=mmr_kc-0108305

My raw space would be 2X8X900 = 14400

And hardware raid should be R5_CS = NN *(N –(1*NL))*Ds

NN = number of nodes
N= number of disk
NL = Number of logical array
DS = Disk space

12600= 2*(8-(1*1))*900

My hardware raid space would be 12600GB

For the network raid space I should be 6300GB  (basically is just divide by 2)

But in reality, My hardware raid space is 11388GB and the network raid divide by 2 is 5694GB

Anyone can enlighten me how storevirtual really calculates it space?
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Commented:
A 900GB HDD is not REALLY 900GB. Vendors sell 900GB as 900,000,000,000 Bytes which results in 838GB. This is the main reason.
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