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The SAN Volume Controller 2145-4F2 node can operate with either the 2145 UPS
or the 2145 UPS-1U. For information about the 2145 UPS-1U, see Chapter 4, "Using
the 2145 UPS-1U," on page 23.
2145 UPS configuration
To provide full redundancy and concurrent maintenance, SAN Volume Controller
2145-4F2 nodes must be installed in pairs.
A 2145 UPS powers one or two SAN Volume Controller 2145-4F2 nodes. If it is
powering two SAN Volume Controller 2145-4F2 nodes, they must be in different
I/O groups of the same SAN Volume Controller cluster.
The following table provides the UPS guidelines for the SAN Volume Controller
2145-4F2:
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 a UPS without first shutting down the SAN Volume
108
IBM System Storage SAN Volume Controller: Hardware Installation Guide
Number of SAN Volume
Controller 2145-4F2 models
2
4
6
8
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 UPS 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
UPSs 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
UPSs in the same I/O group, you must connect these nodes to
different 2145 UPSs. This configuration ensures that cache and cluster
state information is protected in the event of a failure of either the UPS
or the mainline power source.
Number of 2145 UPS units
2
2
4
4
Number of 2145 UPS-1U
units
2
4
6
8
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