IBM System Storage DS3500 Introduction And Implementation Manual page 464

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Your data remains accessible during the defragment operation.
To use this option, all of the logical drives in the array must be online and in Optimal status,
and no logical drive modification operations, such as changing the segment size of a
logical drive, can be in progress.
Use the following procedure to defragment an array:
1. In the Logical tab of the DS Storage Manager (Subsystem Management) window, select
the array, and select the Advanced  Recovery  Defragment Array menu command
as shown in Figure 14-148.
Figure 14-148 Defragment Array
2. You will be asked to confirm that you want to defragment the array, as shown in
Figure 14-149 on page 441.
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IBM System Storage DS3500: Introduction and Implementation Guide
Draft Document for Review March 28, 2011 12:24 pm