Sonnet Technologies Web Management Tool - Manual (Page 77)

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Appendix B - RAID Group Designs
RAID Level 4: Striping, One Parity Drive
RAID 4 writes data across multiple drives or devices (striping)
with parity blocks written to a single drive in the RAID
group. This increases reliability while using fewer drives than
mirroring. RAID Level 4 is best suited for applications that
perform mostly sequential access such as video applications.
See
Figure B-6.
You must have at least three drives to set up RAID Level 4.
DVRAID: Digital Video RAID
Digital Video RAID provides parity redundancy for your
data. Optimized for performance for the high data transfer
rates required in digital video environments, DVRAID is
ATTO Technology proprietary technology which supports
the editing of uncompressed 10-bit High Definition (HD)
video and multiple streams of real-time, uncompressed
Standard Definition (SD) video. See
Figure B-7.
You must use the Quick Digital Video setup wizard in the
Sonnet Web Management Tool.
RAID Level 5: Striping, Parity Distributed
Among Drives
RAID Level 5 increases reliability while using fewer drives
than mirroring by using parity redundancy: parity is
distributed across multiple drives. See
Figure B-8.
The Fusion RX1600Fibre supports 3 to 16 drives per RAID
Level 5 group.
Disk 1
Data 1
Data 4
Data 7
Stripe 1
Stripe 2
Stripe 3
Disk 2
Data 2
Data 5
Data 8
Disk 3
Data 3
Data 6
Data 9
Disk 4
Parity 1–3
Parity 4–6
Parity 7–9
RAID Level 4: Striping, One Parity Drive
Figure B-6
Disk 1
Data 1
Data 4
Data 7
Stripe 1
Stripe 2
Stripe 3
Disk 2
Data 2
Data 5
Data 8
Disk 3
Data 3
Data 6
Data 9
Disk 4
Parity 1–3
Parity 4–6
Parity 7–9
DVRAID: Striping, One Parity Drive
Figure B-7
Disk 1
Data 1
Data 5
Data 9
Parity
10–12
Disk 2
Data 2
Data 6
Parity 7–9
Data 10
Disk 3
Data 3
Parity 4–6
Data 7
Data 11
Disk 4
Parity 1–3
Data 4
Data 8
Data 12
RAID Level 5:
Striping, Parity Distributed Among Drives
Stripe 1
Stripe 2
Stripe 3
Stripe 4
Figure B-8