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Changing An Existing Configuration by Migrating
You can convert one RAID configuration into another while the unit is online. This process is known as RAID Level Migration (RLM).
You can use RAID Level Migration to make two main types of configuration changes:

| RAID Level (for example, a RAID 1 to a RAID 5)

| Unit Capacity Expansion (for example, adding a 4th drive to a 3-drive RAID 5)

You can also use RLM to change the stripe size of a unit.

| Note: A unit being migrated can still be used (I/O still continues), however the performance will be affected while the migrating task is active. You can control how much effect this has on performance by setting the background task rate. For more information, see “Setting Background Task Rate” on page 112.

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

If you want to change the policy settings for an existing unit, there is no need to change the configuration. See Setting Unit Policies.

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