HP Workstation xw8000 - Manual (Page 12)

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Adaptec SCSI RAID 2120S/2200S Software User’s Guide
RAID-50
A RAID-50 is a dual-level array created by using two or more
equal-sized RAID-5s to create a RAID-0.
The top level RAID-0 shares the load among the second-level
RAID-5s, improving both read and write performance. The second
level RAID-5s use of parity provides efficient redundancy.
Simple Volume
A simple volume consists of a single disk drive.
Spanned Volume
A spanned volume is created by joining two or more disk drives.
The drives do not have to be of equal capacity and are connected
end-to-end. A spanned volume offers no redundancy and no
performance advantage over a single drive.
RAID-50
Parity B0
Data 7
Data 11
Parity B3
Drive
Data 4 & Data 5
RAID-5 RAID-5
Data 3
Parity B1
Data 10
Data 15
Drive
Data 2
Data 6
Parity B2
Data 14
Drive
Parity A0
Data 5
Data 9
Parity A3
Drive
Data 1
Parity A1
Data 8
Data 13
Drive
Data 0
Data 4
Parity A2
Data 12
Drive
Data 0 & Data 1
Data 8 & Data 9
Data 12 & Data 13
Data 2 & Data 3
Data 6 & Data 7
Data 10 & Data 11
Data 14 & Data 15
Top-Level Arrays
Second-Level Arrays
UG.book Page 6 Saturday, October 26, 2002 12:08 PM