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On-Line Repair
With a Hot Standby CPU Redundancy system most system component failures can be repaired by replacing the failed component while the system is
1.If the failure is in the active system, control will switch to the backup system. Power can
then be removed from the rack containing the failed component When the
component is replaced and power is restored to the rack, the CPU will become synchronized with the current active unit and, if Primary will take control.
2.If the failure is in the backup ,systemremove power from the rack containing the failed
component and replace the component. | When | power | is restored to the backup unit it |
will become synchronized with the active | unit | and, if | Primary will take control. |
The following paragraphs describe how the system can be repaired without interruption of control. The replacement of each replaceable component is described.
Note
If maintenance is to be performed on a unit when that unit is the active unit in a synchronized system, then control should be switched to the other unit before powering down. This will allow for an orderly transfer of control.
After repairing a defective unit:
1.
2.Verify that the Remote Ready and Remote Active LEDS are on while in STOP mode.
3.Verify that the Local Ready and Local Active LEDs are on in the Active unit.
4.Put the repaired unit in RUN mode.
Maintaining Parallel Bus Termination
It is important when doing
On-Line Repair Recommendations
It is advised when doing
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