Chapter 8. Configuring Units
152 3ware Serial ATA RAID Controller User Guide
These changes can be made using 3DM2 or the CLI. Instructions for using
migrate in 3DM2 are described below. For information about CLI, see 3ware
9000 Series Serial ATA RAID Controller CLI Guide.
This section includes the following topics about changing existing
configurations:
• RAID Level Migration (RLM) Overview
• Changing RAID Level
• Expanding Unit Capacity
• Informing the Operating System of Changed Configuration
RAID Level Migration (RLM) Overview
RAID level migration is the process of converting one RAID configuration to
another. When you migrate a unit to a different configuration, the user data on
it is redistributed to the format of the new configuration. This data
redistribution process is a background task, similar to the rebuild or verify
processes.
Figure 64 shows an example of how data is reconfigured during a migration.
In this example, the migration is from a 4-drive RAID 0 to a 6-drive RAID 5,
with both having the same stripe size. As can be seen, every piece of user data
is moved from its original physical location.
Figure 64. RAID Level Migration Example
Typically, a unit is reconfigured with the same or more storage capacity.
Sometimes additional drives are added. The following table shows valid
reconfigurations, some of which will require the addition of more drives.
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