IBM TotalStorage DS300 Best Practices Manual page 177

Figure 4-134 Confirm the configuration
7. Array migration or Expansion is in progress.
Note: All logical drives in the array will be offline for the period of the
migration or expansion. The logical drives become online after finishing the
migration or expansion process.
When Original drives are deselected, those drives are shown as alien
drives until the migration is finished.
There is no information in the ServeRAID manager console available that a
expansion or migration is in progress. Use the CLI to check the status of
the logical drives to determine when a problem has occurred or if process
is still running.
Chapter 4. TotalStorage DS300 and DS400 management
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