IBM 2145-4F2, Installation Manual

Page: 57 / 143

Chapter 2. UPS
The uninterruptible power supply (UPS) 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
SAN Volume Controller internal disk. The UPS units are required to power the
SAN Volume Controller nodes even if the input power source is uninterruptible.
The SAN Volume Controller 2145-8F2 and SAN Volume Controller 2145-8F4 nodes
can only operate with the 2145 UPS-1U. The SAN Volume Controller 2145-4F2
node can operate with either the 2145 UPS or the 2145 UPS-1U.
Figure 20 on page 28 and Figure 19 provide illustrations of the two types of UPS
units.
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Figure 19. 2145 UPS-1U
© Copyright IBM Corp. 2003, 2006
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