Chapter 4. Using the 2145 UPS-1U
The 2145 uninterruptible power supply-1U (2145 UPS-1U) provides a SAN Volume
Controller node with a secondary power source if you lose power from your
primary power source due to power failures, power sags, power surges, or line
noise.
Unlike the traditional UPS that enables continued operation of the devices that
they supply when power is lost, these UPS units are used exclusively to maintain
data that is held in the SAN Volume Controller dynamic random access memory
(DRAM) in the event of an unexpected loss of external power. Data is saved to the
internal disk of the SAN Volume Controller node. The UPS units are required to
power the SAN Volume Controller nodes even if the input power source is
considered uninterruptible.
The SAN Volume Controller 2145-8G4, SAN Volume Controller 2145-8F4, and SAN
Volume Controller 2145-8F2 nodes can operate only with the 2145 UPS-1U. The
SAN Volume Controller 2145-4F2 node can operate with either the 2145 UPS or the
2145 UPS-1U.
Note: The UPS maintains continuous SAN Volume Controller-specific
communications with its attached SAN Volume Controller nodes. A SAN
Volume Controller node cannot operate without the UPS. The UPS must be
used in accordance with documented guidelines and procedures and must
not power any equipment other than SAN Volume Controller nodes.
2145 UPS-1U configuration
A 2145 UPS-1U powers one SAN Volume Controller node. All SAN Volume
Controller model types are supported by the 2145 UPS-1U.
To make the SAN Volume Controller cluster more resilient to power failure, the
2145 UPS-1Us can be connected to the redundant ac power switch. If a redundant
ac power switch is not used, connecting the two UPSs that are powering an I/O
group to different, independent electrical power sources allows the SAN Volume
Controller cluster to continue to operate with reduced capacity if a single power
source fails.
Each UPS must be in the same rack as the node it powers.
Attention: Do not connect the UPSs to an input power source that does not
conform to standards.
Each UPS includes power (line) cords that connect the UPS to either a redundant
ac power switch, if one exists, a rack power distribution unit (PDU), if one exists,
or to an external power source.
Each UPS 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 UPS units, these cables are wrapped together and supplied as a single
field replaceable unit. The signal cable enables the SAN Volume Controller node to
read status and identification information from the UPS.
© Copyright IBM Corp. 2003, 2007 23
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