Maintaining the PowerVault NX3500 151
NOTE: The PowerVault NX3500 software will not install on unsupported hardware. If
the PowerVault NX3500 media is inserted into a system other than a PowerVault NX3500,
the user is prompted with a message and the system will fail to install the software.
Replacing a PowerVault NX3500 Controller
You may have to replace the PowerVault NX3500:
• In the event of a catastrophic failure where the existing controller cannot
be brought back online.
• When an administrator wishes to replace the hardware.

Prerequisites

Before replacing the PowerVault NX3500 ensure that:
• You have physical access to the controllers.
• A keyboard, monitor, and mouse are connected to the controllers.
• The controller is verified as failed (if it is replaced with a new one).
The procedure for replacing a PowerVault NX3500 involves the following steps:
• Detaching the controller.
• Removing and replacing the controller.
• Attaching the new controller.

Detaching the PowerVault NX3500 Controller

In order to bring the cluster into the single-controller mode you need to
detach a controller while any hardware is being replaced. This ensures that
the system can be brought back to service with minimal downtime.
You may have to detach the controller under the following circumstances:
• A controller needs to be replaced with a new standby cont roller.
• A controller needs to be repaired, possibly after replacing some components.
• The administrator wants to attach a working controller to another (more
critical) cluster.
• The administrator wants to discard the cluster (for example, in order to
use the standby controllers to create a new cluster elsewhere).