ghostnomad.com

Use a disk array
Some allow for disks to fail
Hot swap on failure

Block instead of byte
Parity just on one disk
Between three and five

Still stripe the data
Also stripe parity blocks
Improve performance

Striped data on disks
Dedicate a parity
Three disk minimum

There must be two drives
Disks are exactly the same
Backup in real time

Look in the mirror
Important you have the stripes
Correct all error