Dell PowerVault NX3500 Administrator's Guide - Page 143

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 controller. • 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). To detach a controller: 1 Log in to the CLI using the management access VIP address. To obtain this address, in the NAS Manager, go to the System Management tab and click NetworkSubnetsPrimaryManagement Console VIP. 2 Execute the following command: system maintenance controllers detach start -nosaveConf NOTE: Depending on the configuration and the controller being detached, you may have to disconnect and reboot the system. This will only occur if the controller being detached is the primary controller being accessed by the CLI. If a controller was alive and working prior to initiating the detach procedure, it will be shut down and upon reboot it will appear as a standby controller. In the case of a failed controller, the system adjusts in a manner that allows the connection of a new controller. Maintaining the PowerVault NX3500 143