Power Led On The San Volume Controller - IBM SAN Volume Controller 2145-CG8 Hardware Maintenance Manual

The power-cable assembly is composed of a power cable (two power cables in the SAN Volume
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| Controller model 2145-CG8 or model 2145-CF8) and a signal cable that are bound together. You can
remove the power-cable assembly if you have problems with the power supply and suspect that a power
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or signal cable is defective. When removing the power-cable assembly, ensure that you also remove it
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| from the uninterruptible power supply.
Perform the following steps to remove the power-cable assembly:
| 1. Check the SAN Volume Controller models 2145-CG8, 2145-CF8, 2145-8A4, 2145-8G4, and 2145-8F4 or
2145-8F2 power LED ( 1 in Figure 90).
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v If the light is on, go to step 2.
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v If the light is either off or flashing, power has already been removed from the SAN Volume
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| Controller. Go to step 7 on page 104.
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1
2145-CG8
2145-CF8
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Figure 90. Power LED on the SAN Volume Controller models 2145-CG8, 2145-CF8, 2145-8A4, 2145-8G4, and
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2145-8F4 or 2145-8F2 operator-information panel
1 Power LED
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Important: SAN Volume Controller nodes operate in pairs. Both SAN Volume Controller nodes are
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in the same I/O group. One SAN Volume Controller must be operational if you are servicing the
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| other SAN Volume Controller. If both SAN Volume Controller nodes are not functioning, you cannot
access any of the disks in that I/O group.
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2. Turn off the node while ensuring that its data is mirrored and synchronized. See MAP 5350 in the
IBM System Storage SAN Volume Controller Troubleshooting Guide for more information.
Attention: If both SAN Volume Controller nodes are online, removing the power from one SAN
Volume Controller can cause performance degradation while I/O operations are automatically
rerouted to other SAN Volume Controller. Ensure that this performance outcome is acceptable before
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| continuing with this procedure.
3. Press and release the power-control button 1 shown in Figure 91 on page 104 for SAN Volume
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Controller models 2145-CG8, 2145-CF8, 2145-8A4, 2145-8G4, and 2145-8F4 or 2145-8F2. Wait one
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| minute for the SAN Volume Controller to turn off. Ignore a missing node error code if displayed by
other nodes in the cluster. When maintenance procedures are completed, the error will resolve itself.
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1
2145-8A4 2145-8G4
1 1
2145-8F4
2145-8F2
Chapter 2. Removing and replacing parts
103