Promise Technology FASTTRAK SX4300 - Manual (Page 53)

Chapter 5: Concepts
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Expansion takes place on an existing Functional logical drive without disturbing
the existing data. While the logical drive is expanding, you can access the data as
before. When expasion is complete, your logical drive will have a larger capacity.
RAID Level Migration
To migrate a logical drive is to do one or both of the following:
• Change its RAID level
• Increase the number of disk drives (sometimes called Expansion)
The FastTrak SX4300 and SX8300 RAID Controller cards support RAID Level
Migration. However, you must use the WebPAM software to access this function.
WebPAM ships with the FastTrak SX Series card on the software CD.
Migration takes place on an existing Functional logical drive without disturbing
the existing data. While the logical drive is migrating, you can access the data as
before. When migration is complete, your logical drive will have a different RAID
level and/or a larger capacity.
Different types of logical drives use different organizational models and have
varying benefits. The following outline breaks down the properties for each type
of RAID supported by Promise products.
Level
Current Number
of Drives
Possible Number
of Drives
RAID 5 3 4
RAID 0 3 4
2 3 or 4
1 2, 3 or 4
From To
Increase Redundancy
Capacity Performance Add Lose
RAID 10 RAID 50 •
RAID 5 •
RAID 0 • • •
RAID 5 RAID 50 •*
RAID 10 •
RAID 0 • • •