Dell OpenManage Server Administrator Managed Node for Fluid Cache for DAS Manual do Utilizador Página 44

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44 Understanding RAID Concepts
Figure 3-5. RAID 6
RAID 6 Characteristics:
•Groups
n
disks as one large virtual disk with a capacity of (
n
-2) disks.
Redundant information (parity) is alternately stored on all disks.
The virtual disk remains functional with up to two disk failures. The data
is reconstructed from the surviving disks.
Better read performance, but slower write performance.
Increased redundancy for protection of data.
Two disks per span are required for parity. RAID 6 is more expensive in
terms of disk space.
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