10
Chapter 1 Introduction
SUMMARY COMPARISON OF RAID LEVELS
RAID Common Description Array's Data Data
Level Name Capacity Reliability Transfer
Capacity
Disk
Data distributed across the
0
Striping
disks in the array. ( N ) Low Very
No redundant Information disks High
provided.
1 Mirroring All data Duplicated 1*disk Very High
High
3 Parallel Data sector is subdivided ( N-1 ) Very Highest
Transfer and distributed across all disks High of all
Disks with data disk. Redundant listed
Parity information stored on a alter-
Dedicated parity disk. natives
5 Independent Data sectors are distributed ( N-1 ) Very Very
Access Array as with disk striping, disks High High
with Rotating redundant Information is
Parity interspersed with user data.
