| 摘要 |
A partitioned processing unit is used having two independent processing unit parts (26,28) and a partitioned switching device having two independent switch parts (38,40). Each switch part is associated logically with a corresp. part of the partitioned processing unit. Each processing unit part is connected to an associated group of adapters by a respective primary bus (52,54) and to the group of aoapters of the other unit by a respective secondary bus (46,48). A service processor (14) checks continuously the status of both processing unit parts and if either one fails it controls the bus-switching by operation of the switches (38,40) to maintain all the adaptors connected to whichever processing unit is still working.
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