| 摘要 |
The invention concerns a system comprising a central unit (CPU) associated with one or several input-output control units (Ctl1-Ctl4) and a redundancy disk sub-system (MD), divided into logical units and under the control of two redundant disk controllers (SP-A, SP-B). These are attached to the input-output controller(s) by buses likewise redundant. One first part of the logical units is assigned to the first disk controller (SP-A) and the other part to the second disk controller (SP-B). When a logical unit, assigned to the first disk controller (SP-A) is accessed, the state of the second disk controller (SP-B) is monitored by the backup path. If a breakdown of the second disk controller (SP-B) is detected, all the logical units are toggled on to the first (SP-A) and are assigned thereto. A crippled mode is initiated and access to resources is carried out by the backup path. The invention is applicable to data processing.
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