A RAID 5 uses block-level striping with parity data distributed across all member disks.
Requirements: At least 3 drives
Fault Tolerance: (N – 1) Can tolerate loss of one drive
Capacity: (Size of Smallest Drive) * (Number of Drives – 1)
For most tiny web-projects is django or Ruby on Rails the overkill and that is mostly the problem which is between the framework and the quick solution.
There are a lot Micro Frameworks available without nasty and unnecessary stuff. Here is a short overview of them: