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ADAC Ultra2 S466 Hardware Guide
10
Disk Spanning
Disk spanning allows multiple disk drives to function like
one big drive. Spanning overcomes lack of disk space and
simplifies storage management by combining existing
resources or adding relatively inexpensive resources. For
example, four 400 MB disk drives can be combined to
appear to the operating system as one single 1600 MB
drive.
Spanning alone does not provide reliability or performance
enhancements. Spanned logical drives must have the same
stripe size and must be contiguous. In the following
graphic, RAID 1 array is turned into a RAID 10 array.
Spanning for RAID 10, RAID 30, or RAID 50
Level Description
10 Configure RAID 10 by spanning two contiguous RAID 1 logical drives.
The RAID 1 logical drives must have the same stripe size.
30 Configure RAID 30 by spanning two contiguous RAID 3 logical drives.
The RAID 3 logical drives must have the same stripe size.
50 Configure RAID 50 by spanning two contiguous RAID 5 logical drives.
The RAID 5 logical drives must have the same stripe size.
Note:
Spanning two contiguous RAID 0 logical drives does not produce a new
RAID level or add fault tolerance. It does increase the size of the logical
volume and improves performance by doubling the number of spindles.