AMCC 9550SXU-12MI Manuel - Page 15

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Red Hot RAID 6

The fastest RAID 6 available

RAID 6 eliminates the risk of data loss if a second hard disk drive fails

while the RAID array is rebuilding. In a 3ware RAID 6 system, two sets

of parity are calculated, written, and rotated across all the drives.

This second simultaneous P + Q parity calculation allows the array

to survive up to two drive failures without losing data, for significantly

improved fault tolerance. RAID 6-enabled 9650SE controllers deliver

unequaled RAID 6 performance.

RAID 6 represents a sea change in the RAID landscape. It provides

the industry with higher levels of data protection, data availability and

fault tolerance than RAID 5. By assuring data availability following a

second drive failure, users can rest assured that they are enjoying

maximum data protection, both in normal and degraded modes.

And, with RAID 6 enabled 3ware controllers, RAID 6 will not cripple

performance.

RAID 6 Enabled 3ware Controllers

• 9650SE-8LPML

• 9650SE-12ML

• 9650SE-16ML

• 9650SE-24M8

Host Data

Disk #1

Disk #2

Disk #3

P1 Parity

Q1 Parity

Block 1

Block 4

P2 Parity

Q2 Parity

Block 7

Block 8

P3 Parity

Block 10

Block 11

Block 12

Striped Data with Distributed Double Parity — RAID 6

3ware RAID 6: Two sets of parity data, P + Q, are striped across

disks. RAID 6 safeguards against data loss during rebuild mode

by allowing up to two consecutive drive failures for maximum

fault tolerance.

• High capacity systems with eight or more

high capacity drives

• For enterprise/mission critical installations

Disk #4

Disk #5

Block 2

Block 3

Block 5

Block 6

Q3 Parity

Block 9

P4 Parity

Q4 Parity