Q

Calculating space for parity in RAID-5

Brett Cooper offers advice to a reader who asked: "What are the calculations for RAID-5 in regards to the amount of space parity will consume? For instance, if I have a RAID-5 with 10 146 GB drives, what is the percent factor of space used for parity?"

What are the calculations for RAID-5 in regards to the amount of space parity will consume? For instance, if I...

have a RAID-5 with 10 146 GB drives, what is the percent factor of space used for parity?

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.

This was last published in January 2005

Dig Deeper on RAID

PRO+

Content

Find more PRO+ content and other member only offers, here.

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

Start the conversation

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

-ADS BY GOOGLE

SearchSolidStateStorage

SearchConvergedInfrastructure

SearchCloudStorage

SearchDisasterRecovery

SearchDataBackup

Close