IBM Advanced SerialRAID Adapters SA33-3285-02 User Manual page 217

Dual-Host System with Primary Disk Drive Missing
| Figure 30 shows a dual-host system that has just been switched on. The system
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contains a RAID-1 array whose primary disk drive is missing. The array remains online,
| but in the Exposed state until one of the following occurs:
v The missing primary disk drive becomes available again before a write operation to
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the array occurs. Under this condition, the restored disk drive is returned as the array
| primary disk drive, and the array returns to the Good state.
v A write operation to the array occurs before the missing primary disk drive becomes
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available again. Under this condition:
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– If a hot spare disk drive is available, that hot spare disk drive automatically
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– If, after the write operation occurs, no hot spare disk drive is available, the array
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System 1
SSA Adapter
Figure 30. Dual-Host System with Primary Disk Drive Missing
becomes the new primary disk drive, and the array goes into the Rebuilding state.
If the missing primary disk drive then becomes available again, it is rejected.
enters the Degraded state. If the missing primary disk drive then becomes
available again, it is rejected.
Primary 1
Split Array Resolution
= Primary
Secondary 1
Chapter 8. Split-Site Management
System 2
SSA Adapter
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