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RAID Level 6: striping, two parity blocks distributed among drives
RAID Level 6 increases reliability for mission critical
applications by striping both data and dual parity
across multiple drives, writing data and parity blocks
across all the drives in a RAID Group. RAID 6 can
Disk 1
Stripe 1
Data 1
Stripe 2
Data 5
Stripe 3
Data 9
Stripe 4
Parity 10-12
tolerate failure of two drives and provides redundancy
during rebuilds.
The ATTO FastStream requires at least four drives to
build a RAID 6 group. Two drives per RAID Group are
used for parity protection and are unavailable for data.
Disk 2
Disk 3
Data 2
Data 3
Data 6
Parity 4-6
Parity 7-9
Parity 7-9
Data 10
Parity 10-12
Disk 4
Disk 5
Parity 1-3
Parity 1-3
Parity 4-6
Data 4
Data 7
Data 8
Data 11
Data 12
iv
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