IBM DS3500 - Place Controller in Service Mode

Chapter 14. Administration - Support 431
Draft Document for Review March 28, 2011 12:24 pm 7914support2-0209.fm
Place controller in service mode
You can use the place controller in Service Mode option to safely run controller diagnostics
without affecting data availability. These conditions apply when you use Service mode:
򐂰 When you place a controller into Service mode, all of the logical drives are forced to the
active controller. This mode provides for continuous data access through the active
controller. The preferred logical drive owner does not change. When the controller is
removed from Service mode, the logical drives are redistributed back to their preferred
owner.
򐂰 You can only place a controller into Service mode only if two controllers are in the storage
subsystem and they are both active.
򐂰 Service mode is a persistent state. If a controller is reset, goes through a power failure, or
is removed and reinstalled, the controller remains in Service mode.
򐂰 You cannot make a controller that is in Service mode the owner of any logical drive.
Use the following procedure to set the controller in or out of service mode:
1. Select the controller in the Physical tab of the DS Storage Manager (Subsystem
Management) window and then select the Advanced  Recovery  Place controller 
In Service Mode menu command, as shown in Figure 14-136.
Figure 14-136 Place controller In Service Mode
2. The window shown in Figure 14-137 on page 432 will be displayed. Read the information
and then click the yes button to confirm that you want to place the controller in service
mode.