126 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
If a second AC power outage occurs before the batteries have completed charging, the 
system starts in service state and does not permit I/O operations to be restarted until the 
batteries are half charged, which provides enough capacity to perform a clean system shut 
down in case of another power loss. The recharging process takes approximately 30 minutes.
The system automatically schedules maintenance battery discharge cycles to extend the 
lifetime of the batteries and ensure that the system can accurately measure the charge in the 
batteries. Discharge cycles ensure that the batteries have sufficient charge to protect the 
Storwize V7000 system. For more information about maintenance discharge cycles, see this 
IBM Knowledge Center web page.
To shut down your Storwize V7000 system, complete the following steps:
1. Ensure that no hosts are using the storage system, and that you stopped all FlashCopy 
mappings, remote copy relationships, data migration operations, and forced deletions.
2. In the GUI, click Monitoring → System. Then, click System Actions and choose Power 
off System, as shown in Figure 4-43.
Figure 4-43   Initiating system power off
3. A confirmation window opens, as shown in Figure 4-44.
Figure 4-44   Power off warning window