Procedure: Powering off the system

Sometimes, it is necessary to power down all node canisters in a system. For example, you might need to shut down the system before you do the maintenance actions in your data center.

Before you begin

Notes:

It is not necessary to shut down the entire system (all node canisters) when you complete service actions.
Service actions upon a node canister require only one node canister in the control enclosure to be shut down. If one node canister of an I/O group is online and communicating with hosts and other nodes, volumes that depend on resources of the I/O group can remain online.
Service actions upon a control enclosure might require the control enclosure to be shut down. In this case, the I/O group that is provided by the control enclosure goes offline. All volumes that depend on that I/O group become disabled. However, other I/O groups in the system can continue to operate.

Procedure

Stop all host I/O to volumes on the system.
Shut down the system by using the management GUI. Click Monitoring > System Hardware. From the System Actions menu, select Power Off System.
Disconnect the power cords.
1. If you are servicing the control enclosure only, disconnect the power cords from both power supply units (PSUs) in the control enclosure.
  
  Note: You do not need to power off the expansion enclosures.
2. If you are preparing for site maintenance, disconnect the power cords from both power supplies in each expansion enclosure in the control enclosure's SAS chains.
  
  Note: The 2U and 5U expansion enclosures do not have a power button. Each expansion enclosure has two PSUs.
When you are ready to restore power to the control enclosure and any expansion enclosures, follow the appropriate procedures for your system configuration.