I am posting the spreadsheet that accompanies the Flash Memory Summit 2014 Seminar A chart deck. This is a LibreOffice 4 spreadsheet. Note that it includes a macro that extends the range of the cumulative binomial distribution. Interestingly, LibreOffice suffers from the same lack of precision that Excel does. The macro is provided as-is, and is not guaranteed to work in all cases. [Translation: I haven’t had time to debug it and the error handling in LibreOffice basic is abysmal.]
The spreadsheet shows how to compute reliability for flash-based storage systems, and compares various RAID architectures when using a DNR ECC approach (described in the chart deck).
Note: I have seen a lot of talk in the industry about how new systems use erasure codes instead of RAID. Technically, all RAID designs use erasure codes – even mirroring (that’s called a replication code). I use the term RAID loosely to describe a system utilizing an erasure code to protect against data loss.
You can download the RAID Reliability Spreadsheet.
The spreadsheet is provide under GPLv2.