BGD Software Inc. - Downloads - Free Enterprise System Architecture Tools

Downloads - Free Enterprise System Architecture Tools
Storage Array Availability Calculator	Based on only two things that you need to enter: MTBF (mean-time-between-failures) for type of disk that you are considering and MTTR (mean-time-to-repair) based on a hardware support contract and voila - you'll see (in colour, no less) which type of RAID and how wide may meet your SLA requirements. Best of all, it's free... give it a try.