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Develop specifications for a server, how much disk space is actually available for data in RAID level 5 when there are four disks? 90%, 75%, 65% or 50%?

I am not sure how to figure this out....if you could explain I would appreciated it.  
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pj1959
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pj1959
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pj1959Author Commented:
I think I figured it out....if I am correct the answer would be 75%.  (N-1)/N which mean N=4 disks therefore 4-1=3   3/4=75%  am I correct?  if so thx for your help.
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LucFCommented:
Hi pj1959,

Yes, you're right, the equivalent of one disk is lost to store the parity information. So if you'd have for example all 250GB disks, that would striped make 1000GB, will in a RAID-5 configuration only be able to store 750GB.

Greetings,

LucF
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pj1959Author Commented:
Thx for explaining it to me.  Now I am wondering should I give myself the point since I figured it out or should I go ahead and give it to you?  
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LucFCommented:
Nah, just ask for a refund at http:/Community_Support/

LucF
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pj1959Author Commented:
Refund?  I answered my own question since I figured it out before my question could be answer.  I would like to close this but forgot how or what I am supposed to do.
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LucFCommented:
Yes, a refund of your points as explained in the helppages:

I answered my question myself. What do I do?
http://www.experts-exchange.com/help.jsp#hi70

LucF
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CetusMODCommented:
Closed, 125 points refunded.
CetusMOD
Community Support Moderator
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