UPS devices provide backup power to the Oracle FS System in the event of a power failure. The system monitors the UPS activities and reports the health of the device.
Typically, enterprise class products like the Oracle FS System do not use a UPS and rely on generator backed power supply in the data centers. However, if you use a UPS, it must be based on the maximum wattage requirements of the sum total of all the Oracle FS System components. The UPS, if used, should conform to the APC PowerNet MIB specifications so that it can send SNMP traps to the Oracle FS System to indicate that it is operating in battery mode or in normal mode and that the Oracle FS System should be configured to receive the traps. For more information about managing APC products that can be monitored and configured with SNMP, see the Schneider Electric MIB Reference Guide (http://www.apcmedia.com/salestools/JGAY-83UPH9/JGAY-83UPH9_R0_EN.pdf). In short, a UPS system must be based on the maximum wattage requirements of the sum total of all the Oracle FS System components. Up to four devices can be monitored by the system. The information gathered from the UPS includes:
Communication status
Power source
Battery status
In the event of a power failure, the UPS device switches from AC to battery power, and then sends an SNMP Trap message to the Oracle FS System indicating that the UPS is on battery power. The Oracle FS System then switches to a conservative operating state, where all data writes are to the storage arrays to protect data should the UPS battery drain before normal power can be restored. This conservative state is exited when the UPS device sends an SNMP Trap message to the Oracle FS System indicating that the UPS is not on battery and returns the Oracle FS System to normal cached operation.