Required connections for using uninterruptible power supplies with MetroCluster configurations
You can use a UPS (Uninterruptible Power Supply) with your MetroCluster configurations. The UPS enables the system to fail over gracefully if power fails for one of the nodes, or to shut down gracefully if power fails for both nodes. You must ensure that the correct equipment is connected to the UPS.
The equipment that you need to connect to the UPS depends on how widespread a power outage you want to protect against. Always connect both controllers, any Fibre Channel switches in use, and any inter-switch link infrastructure (for example, a Dense Wavelength Division Multiplexing, or DWDM) to the UPS.
You can leave the disks on the regular power supply. In this case, if power is interrupted to one site, the controller can access the other plex until it shuts down or power is restored. If, however, power is interrupted to both sites at the same time and the disks are not connected to the UPS, the MetroCluster configuration cannot shut down gracefully.