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, because 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.