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RAID 5? how much space will i have?(n00b)

post #1 of 12
Thread Starter 
I have 3 WD 640Gb AAKS drives that i want to set up in RAID 5. How much total space will i have?
    
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post #2 of 12
640*n-n = 1280
post #3 of 12
Whats RAID5?

Like how are the driver arranged?
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post #4 of 12
Thread Starter 
Quote:
Originally Posted by RussianGrimmReaper View Post
640*n-n = 1280
thats what i needed. thanks for the quick reply
    
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post #5 of 12
Thread Starter 
What does the 'N' stand for?
    
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post #6 of 12
Quote:
Originally Posted by The_Rocker View Post
Whats RAID5?

Like how are the driver arranged?
I believe each drive has 66% of the data plus parity so if one disk fails it can still rebuild a new drive with the data from the 2 remaining disks (For a 3 disk set up.)
    
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post #7 of 12
Quote:
Originally Posted by stingerjg View Post
What does the 'N' stand for?
The number of drives.
Quote:
Originally Posted by alk View Post
I believe each drive has 66% of the data plus parity so if one disk fails it can still rebuild a new drive with the data from the 2 remaining disks (For a 3 disk set up.)
2 of the disks carry all of the data, one has parity.
http://en.wikipedia.org/wiki/RAID5#RAID_5
post #8 of 12
Or: Add all the drives less one
or for even less math. one drive is not counted because it is looking after the others. All the other drives count for size.
 
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post #9 of 12
Quote:
Originally Posted by RussianGrimmReaper View Post
The number of drives.
2 of the disks carry all of the data, one has parity.
http://en.wikipedia.org/wiki/RAID5#RAID_5
Look again at that wikipedia page. Each drive contains parity for different stripes. This means parity is evenly distributede between disks.
    
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post #10 of 12
Quote:
Originally Posted by alk View Post
Look again at that wikipedia page. Each drive contains parity for different stripes. This means parity is evenly distributede between disks.
Nvm, I was thinking RAID 4
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