Powering on and powering off the Lenovo Storage V7000 Gen1 clustered system

Powering on the system

1. (Optional) Power^® on Fibre Channel switches.
2. (Optional) Power on external storage systems.
3. Power on expansion enclosures.
4. Power on the control enclosure.
5. Start hosts.

Before you power off the system

To remove all input power to a system (for example, the machine room power must be shut down for maintenance), you must shut down the system before power is removed. Shutting down the system causes all nodes in the system to store data to the internal drive and then enter a standby state. In standby state, volumes provided by the system are no longer accessible.

If the system is not shut down before power to the nodes is turned off, the nodes detect the loss of power and continue to run on battery power until all data that is held in memory is saved to the internal drive.

When input power is restored to the enclosures, the batteries in the nodes recharge. However, the nodes do not permit any I/O activity until the batteries have sufficient charge to enable all the data on the nodes to be saved in the event of an unexpected power loss. This might take as long as two hours if the batteries have been discharged because nodes have run on battery power. Shutting down the system prior to removing input power to the batteries prevents the battery power from being drained and makes it possible for I/O activity to resume as soon as input power is restored.

Powering off the system

1. Stop hosts.
2. Shut down the system by using the management GUI. Select Monitoring > System. From the Actions menu, select Power Off.
3. Wait for the power LED on both node canisters in all control enclosures to start flashing, which indicates that the shutdown operation has completed.
   The following figure shows the LEDs on the node canisters. The power LED is the LED on the left when the canister is top-side up.

   Figure 1. LEDs on the node canisters
   
   
4. Using the power switches, power off the control enclosures.
5. Using the power switches, power off the expansion enclosures.
6. (Optional) Shut down external storage systems.
7. (Optional) Shut down Fibre Channel switches.