IBM 2145-4F2, Installation Manual

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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 SAN Volume
Controller UPS must be used in accordance with documented guidelines
and procedures and must not power any equipment other than SAN
Volume Controller nodes.
UPS configuration
To provide full redundancy and concurrent maintenance, SAN Volume Controller
nodes must be installed in pairs.
You must connect each SAN Volume Controller node of a pair to a different
uninterruptible power supply (UPS). Each 2145 UPS can support up to two SAN
Volume Controller 2145-4F2 nodes. The 2145 UPS-1U can only support one SAN
Volume Controller 2145-8F4 node, one SAN Volume Controller 2145-8F2 node, or
one SAN Volume Controller 2145-4F2 node. You can connect the two UPS units for
the pair to different independent electrical power sources. This reduces the chance
of an input power failure at both UPS units.
The UPS must be in the same rack as the nodes.
The following table provides the UPS guidelines for the SAN Volume Controller
2145-4F2:
Number of SAN Volume
Controller 2145-4F2 models Number of 2145 UPS units
Number of 2145 UPS-1U
units
2 2 2
4 2 4
6 4 6
8 4 8
Figure 20. 2145 UPS
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IBM System Storage SAN Volume Controller: Installation Guide
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