Powering on and powering off the system

To power on or to power off the system, complete the steps in this procedure in the order given.

• To power on the system, complete the following steps:
  1. Power on all expansion enclosures by connecting both power supply units of an enclosure to their power sources with the proper power cords.
     Ensure that any circuit breakers or switches on the power sources are turned on. The enclosures do not have power switches. Repeat this step for each expansion enclosure in the system.

     Note: Each enclosure has two power supply units, each with its own power cord. To provide power failure redundancy, connect each power cord to a separate power circuit.
  2. On each expansion canister, check the indicator LEDs. Figure 1 shows an example of the indicators. The format may vary, depending on the type of expansion enclosure you are using.

     

     •  1  Power
     •  2  Status
     •  3  Fault

     The canister is ready with no critical errors when Power is illuminated, Status is illuminated, and Fault is off. If a canister is not ready, see the troubleshooting procedure for understanding the system status using LEDs.

  3. Wait for all expansion canisters to finish powering on.
  4. Power on each control enclosure by connecting both power supply units of the enclosure to their power sources with the proper power cables.
     Ensure that any circuit breakers or switches on the power sources are turned on. Control enclosures do not have power switches.

     Note: Each control enclosure has two power supply units, each with its own power cord. To provide power failure redundancy, connect each power cord to a separate power circuit.

     On each node canister in the control enclosure, check the LED indicators. Figure 2 shows an example.

     

     •  1  Power
     •  2  Status
     •  3  Fault

     The node canister is ready with no critical errors when Power is illuminated, Status is flashing, and Fault is off. If a canister is not ready, see the troubleshooting procedure for understanding the system status using LEDs.

Before you power off the system

Before you remove all input power to the system (for example, to shut down the machine room for maintenance), you must shut down all FlashSystem 7300 system processes while still powered.

Shutting down the system causes all nodes in the system to store data to internal drives before entering a standby state. In standby state, volumes provided by the system are no longer accessible.

If the system is not shut down before input power is turned off, the FlashSystem 7300 nodes detect the loss of power. The nodes continue to run on battery power until they save all data in memory to internal drives.

When input power is restored, batteries in the nodes recharge. No I/O activity occurs until the batteries have sufficient charge to enable the nodes to save all their data in the event of another power loss. Recharging might take two hours if the nodes ran long enough without power to discharge their batteries. Shutting down the system before removing input power prevents battery drain and enables I/O activity to resume immediately when input power is restored.

• To power off the system, complete the following steps:
  1. Stop all host I/O to volumes on the system.
  2. Shut down the system from the management GUI. Select Monitoring > System. On the System - Overview page, select System - Actions > Power Off System.
  3. Wait for the power LEDs on all node canisters (Figure 2) in all control enclosures to blink at 1 Hz, indicating the shutdown operation is complete.
  4. Disconnect the power cords from both power supplies in each control enclosure.
  5. Disconnect the power cords from both power supplies in each expansion enclosure.
  6. Ensure that all cables are stored in an orderly way to reduce the risk of cable damage when replaceable units are removed or inserted.