Raid 5

I have  4 hard drive each with 1TB  running Raid 5 what should my total usable space be?
D-Tech-ManAsked:
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basicinstinctCommented:
3TB
David_HagermanCommented:
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
SjizzelCommented:
Another RAID calculator:

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

raid 5 capacity is all disks -1
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noxchoGlobal Support CoordinatorCommented:
Yup, 3TB.
DavidPresidentCommented:
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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Gerald ConnollyCommented:
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
D-Tech-ManAuthor Commented:
Thank you
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