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.
Dig Deeper on RAID
Related Q&A from Brett Cooper
We are currently using an HDS9960 array and are planning to upgrade early next year to another enterprise array. We're in the process of evaluating ...continue reading
We are looking at purchasing a new storage system for our financial application, what should we be looking for? The system needs to provide very high...continue reading
Storage management expert Brett Cooper answers the question: Are there any basic guides on how a manufacturing company could manage their data better?continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.