Calculating space for parity in RAID-5

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RELATED GLOSSARY TERMS Terms from Whatis.com − the technology online dictionary disk cache  (SearchStorage.com) disk duplexing  (SearchStorage.com) disk striping  (SearchStorage.com) double-parity RAID  (SearchStorage.com) hard disk  (SearchStorage.com) hard disk drive  (SearchStorage.com) parity  (SearchStorage.com) RAID  (SearchStorage.com) storage medium  (SearchStorage.com)

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I just got asked the same question a few weeks ago. In answer to your specific question, 10[x] 146 GB drives in a RAID-5 configuration would provide 1.316 TB of useable space. The way that I figured this out is using a RAID calculator from ibeast that can be found at: http://www.ibeast.com/content/tools/RaidCalc/RaidCalc.asp

Also, a fellow SearchStorage.com expert, Stephen Foskett answered a similar question and provided a formula for calculating disk space on RAID-5 sets: http://searchstorage.techtarget.com/ateQuestionNResponse/0,289625,sid5_cid637415_tax297924,00.html

The space calculation shows that the parity stripe would consume approximately 10% of the overall storage space, or 146 GB of disk space.