RAID Level 5
RAID level 5 uses data parity. RAID level 5 stripes both data and parity information across three or more drives. It provides data striping at the byte level and also stripe error correction information (rotating parity array). This results in excellent performance and good fault tolerance.
If a drive failure occurs, subsequent read and write operations are directed to the other surviving drives. A replacement drive can then be rebuilt using the data from the surviving drives. Since data is duplicated on the primary and additional drives, four 120 GB collectively have a maximum of 360 GB on which to store data.
RAID Level 10
A RAID 10 array combines the high data access rate of a RAID level 0 array and the data protection (redundancy) of a RAID level 1 mirror by striping data across two drives and mirroring that striped data on a set of two drives.
RAID 1+0
A1 | A2 | A3 | Ap |
B1 | B2 | Bp | B3 |
C1 | Cp | C2 | C3 |
Dp | D1 | D2 | D3 |
If a drive failure occurs, subsequent read and write operations are directed to the other surviving drives. A replacement drive can then be rebuilt using the data from the surviving drives. Also, because data is duplicated on the primary and additional drives, four 120 GB collectively have a maximum of 240 GB on which to store data.
26
CHAPTER 4: USING YOUR DESKTOP
