Launching the STH RAID Calculator v1

Posted March 26, 2012 by Patrick Kennedy in Storage Reliability

A few weeks ago I decided that I was going to put a renewed effort into building useful tools for The first tool is relatively simple, it’s a RAID calculator that allows you to pick RAID levels then computes the resulting array capacity. Feel free to check out ServeTheHome’s RAID Calculator and give some feedback on the future direction of the tool. I do plan to have the simple Poisson distribution based MTTDL (mean time to data loss) calculations found in the MTTDL primer added shortly to the RAID Calculator, as well as explicitly add ZFS RAID levels such as RAID-Z, RAID-Z2, RAID-Z3 (for now one can use RAID 5 and RAID 6 to approximate.) One other item for the RAID Calculator is to add redundancy options such as support for Windows Home Server V1’s drive extender and Windows 8’s storage spaces in the near future. Another item we will be adding shortly to the RAID calculator is the ability for the tool to accept any drive size for all of the RAID levels.

Just disclaiming up-front, I know the RAID calculator is not perfect and probably will never be perfect, but I wanted to start getting feedback soon. Also, if anyone has any desire to build a similar tool, or has a great idea for another home server tool, feel free to let me know. I always enjoy getting feedback on what readers would like to see on the site.

About the Author

Patrick Kennedy

Patrick has been running ServeTheHome since 2009 and covers a wide variety of home and small business IT topics. For his day job, Patrick is a management consultant focused in the technology industry and has worked with numerous large hardware and storage vendors in the Silicon Valley. The goal of STH is simply to help users find some information about basic server building blocks. If you have any helpful information please feel free to post on the forums.



    I tried a 8x 3TB Raid 6 and it said 0 TB :(

    Hazzim Anaya

    Raid level don’t care, the problem it’s 3TB Disk size appear’s don’t have value.


    There is no option for 2tb disks.


    If would be awesome if the RAID and disk size options didn’t reset after each calculation!


    2TB and 3TB drives should be fixed. 4TB is currently broken but will have that fixed tonight. The extra RAID 6 in the capacity column should be gone also.


    great job!!! very handy app

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