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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%?

Posted on 2004-08-29
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Last Modified: 2010-04-03
I am not sure how to figure this out....if you could explain I would appreciated it.  
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Question by:pj1959
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by:pj1959
ID: 11924852
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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by:Luc Franken
ID: 11924875
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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by:pj1959
ID: 11926144
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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by:Luc Franken
ID: 11926168
Nah, just ask for a refund at http:/Community_Support/

LucF
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by:pj1959
ID: 11926232
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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by:Luc Franken
ID: 11926246
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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