2145 UPS operation

If input power is disconnected from a 2145 UPS, a fully-operational SAN Volume Controller 2145-4F2 node that is connected to that 2145 UPS performs a power-down sequence.

This operation, which saves the configuration and cache data to an internal disk in the SAN Volume Controller 2145-4F2 node, typically takes about three minutes, at which time power is removed from the output of the 2145 UPS. In the event of a delay in the completion of the power-down sequence, the 2145 UPS output power is removed five minutes after the power is disconnected from the 2145 UPS. Because this operation is controlled by the SAN Volume Controller 2145-4F2 node, a 2145 UPS that is not connected to an active SAN Volume Controller 2145-4F2 node does not shut off within the five-minute required period.

Important: Do not shut down an uninterruptible power supply without first shutting down the SAN Volume Controller 2145-4F2 node that it supports. Data integrity can be compromised by pushing the 2145 UPS power-off button when the node is still operating. However, in the case of an emergency, you can manually shut down the uninterruptible power supply by pushing the 2145 UPS power-off button when the node is still operating. Service actions must then be performed before the node can resume normal operations. If multiple uninterruptible power supply units are shut down before the nodes they support, data can be corrupted.

If you have two SAN Volume Controller 2145-4F2 nodes that use 2145 UPS units in the same I/O group, you must connect these nodes to different 2145 UPS units. This configuration ensures that cache and cluster state information is protected in the event of a failure of either the uninterruptible power supply or the mainline power source.