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Raid 5

Posted on 2012-04-13
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Last Modified: 2012-07-23
I have  4 hard drive each with 1TB  running Raid 5 what should my total usable space be?
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Question by:D-Tech-Man
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7 Comments
 
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Expert Comment

by:basicinstinct
ID: 37841403
3TB
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Expert Comment

by:David_Hagerman
ID: 37841428
3TB is correct, if you choose RAID 5 (Stripe set with parity) however if you choose other options you might loose more space

Here is a raid Calculator to assist with these calculations
http://www.raid-calculator.com/Default.aspx
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Assisted Solution

by:Sjizzel
Sjizzel earned 250 total points
ID: 37841433
Another RAID calculator:

http://www.ibeast.com/content/tools/RaidCalc/RaidCalc.asp

raid 5 capacity is all disks -1
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LVL 47

Expert Comment

by:noxcho
ID: 37841464
Yup, 3TB.
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dlethe earned 250 total points
ID: 37842073
3TB, but since you are asking the question, I'll throw out that older RAID controllers have problems going past 2.09TB, and that unless you have an UEFI BIOS, then the largest device you can boot is also 2.09TB.  So if you aren't seeing 3TB then it is likely due to one of these reasons.
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Expert Comment

by:Gerald Connolly
ID: 37846489
Don't forget to factor in filesystem overheads and the effect of partitioning, and oh don't be caught out by the 1000x1000 v 1024x1024 debate on reporting of sizes
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Author Closing Comment

by:D-Tech-Man
ID: 38214878
Thank you
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