Adaptec AAA-133U2 - AAA 133 RAID Controller Hardware Manual page 39

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Creating an Array With the ARRAYCONFIG U2 Utility
6
Type an array name and press Enter. The name can be up to 15
characters long and can include spaces and any other printable
characters.
7
Select an array type. Your options are
– RAID 0: Data is striped across the disks in a RAID 0 array,
allowing for faster I/O performance than a single disk.
RAID 0 arrays do not store redundant data; if any disk in
the array fails, all data is lost.
– RAID 1: Data is mirrored on one pair of disks. If one disk
fails, data is available. The actual data capacity of the array
equals half the available disk space.
– RAID 5: The array contains redundant (parity) data dis-
tributed across all disks in the array. If any one disk fails,
data can be reconstructed from the parity information. If a
second disk fails before the array has been reconstructed,
all data is lost. The actual usable data capacity of the array
is equal to one less than the total number of disks. (One
disk's worth of capacity is needed to hold the parity
information.)
– RAID 0/1: Data is striped and mirrored on two or more
pairs of disks. If one disk in a pair fails, data is available.
The actual data capacity of the array equals half the total
available disk space.
See the Adaptec CI/O Management Software User's Guide for more
information on selecting a RAID level.
8
Select the number of drives you want in the array and press
Enter. This number should not include spares (drives that auto-
matically replace failed array drives). The number of drives
available for assignment is listed on the screen.
Note:
This step does not apply to RAID 1 arrays,
which have two drives by definition.
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