Silicon Graphics TP9100, Installation Instructions And User Manual

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Administrative Functions
007-4382-002 97
Gracefully Bring a 2nd Controller On Line
When the Gracefully Bring a 2nd Controller On Line menu selection is made, the screen
shown in Figure 3-61 appears.
Figure 3-61 Warning Screen
When a failed controller is replaced, the system either automatically detects the
replacement (if configured for automatic failback), or is informed of the replacement by
issuing this command. The following steps outline the failback process executed by the
surviving controller:
1. A replacement controller is detected.
2. The surviving controller releases its partner from reset.
3. Once the replacement controller completes initialization and is ready to resume I/O
requests, the surviving controller quiesces both ports by responding with BUSY
status to new I/O requests.
4. The surviving controller disables the failover port or secondary ID.
5. The surviving controller enables its primary ports.
6. The replacement controller enables its primary ports.
7. Both controllers disable conservative cache (if enabled) for write-back system drives
and resume normal dual-active controller operation.
Click YES to force the failback.
Note: A replacement controller is held reset if a consistency check is in progress.