| 摘要 |
<p>PROBLEM TO BE SOLVED: To simplify the circuit system of the drive module of a hot line insertion/detachment object and to reduce a hardware amount by supplying packaging check signals from a disk array controller to the respective drive modules of the hot line insertion/detachment object. SOLUTION: In the case that the drive module 92b fails, an array data control circuit 804 starts a degradation operation for which the drive module 92b is cut off by the instruction of a CPU 805. Also, a packaging check circuit 806 actively (low level) outputs signals 201-203 for packaging check in time sharing and checks the packaging state of the respective drive modules. Then, at the time of the hot line insertion/detachment of the drive module 92b, when an array data bus 103 is during data transfer at the time of detecting the change of return signals 213 for the packaging check, by interrupting a data transfer processing and executing retrial, the malfunction of the data transfer processing is prevented.</p> |
