A RAID-5 volume must consist of at least three components. The more components a RAID-5 volume contains, however, the longer read and write operations take when a component fails.
RAID-5 volumes cannot be striped, concatenated, or mirrored.
Do not create a RAID-5 volume from a component that contains an existing file system. Doing so will erase the data during the RAID-5 initialization process.
A RAID-5 volume (with no hot spares) can only handle a single component failure.
When you create RAID-5 volumes, use components across separate controllers. Controllers and associated cables tend to fail more often than disks.
Use components of the same size. Creating a RAID-5 volume with components of different sizes results in unused disk space.