A 2145 UPS-1U powers one SAN Volume Controller node.
To make the SAN Volume Controller cluster more resilient against power failure, the 2145 UPS-1U units can be connected to the redundant ac-power switch.
If a redundant ac-power switch is not used, the two uninterruptible power supplies that power an I/O group can be connected to different, independent electrical power sources. In this case, if a single power source fails, only one node in the I/O group stops and the SAN Volume Controller cluster can continue to operate, although with reduced performance.
Each uninterruptible power supply must be in the same rack as the node that it powers.
Each 2145 UPS-1U includes one power cord that connects the uninterruptible power supply to a redundant ac-power switch, if one exists, or to a rack power distribution unit (PDU), if one exists. The 2145 UPS-1U also includes an alternative power cable to connect to an external power source that is specific to your geography.
Each 2145 UPS-1U is connected to a SAN Volume Controller node with a power cable and a signal cable. To avoid the possibility of power and signal cables being connected to different uninterruptible power supplies, these cables are wrapped together and supplied as a single field-replaceable unit (FRU). The SAN Volume Controller node reads status and identification information from the uninterruptible power supply using the signal cable.