Patent ID: 6338054
Filing Date: 2002-01-08
Classification: G06F,Y10S

Abstract:
In a system having a file controlling apparatus provided between a plurality of processing apparatuses and a plurality of file storing apparatuses to control an accessing operation on each of said file storing apparatuses in response to a command from each of said processing apparatuses in order that said plurality of processing apparatuses share said plurality of file storing apparatuses, a method for controlling re-connection of a channel interface between one of said plurality of processing apparatuses and said file controlling apparatus due to generation of a re-connecting factor, after said channel interface therebetween has been temporarily made to be in a disconnected state since the processing apparatus cannot immediately access to one of said plurality of file storing apparatuses when the processing apparatus accesses to the file storing apparatus, said channel interface re-connecting controlling method comprising:monitoring generation of said re-connecting factors; storing the order of generation of said re-connecting factors; and re-connecting said channel interface between the processing apparatus relating to each of said re-connecting factors and the file controlling apparatus relating to each of said re-connecting factors in the stored order of generation of said re-connecting factors; wherein said re-connecting factors comprise: a first re-connecting factor generated when the file storing apparatus is released from another processing apparatus, after said file controlling apparatus makes a busy report to the former processing apparatus and a channel interface between the former processing apparatus and said file controlling apparatus has been temporarily made to be in a disconnected state, since the file storing apparatus is occupied by the latter processing apparatus when the former processing apparatus accesses to the file storing apparatus; and a second re-connecting factor generated when said file controlling apparatus completes a staging operation, which staging operation reads data from said file storing apparatus into a cache memory when the data to be accessed does not exist in the cache memory in said file controlling apparatus, after a channel interface between the processing apparatus and said file controlling apparatus has been temporarily made to be in a disconnected state since said file controlling apparatus shifts to said staging operation on a file storing apparatus in response to a command from a certain processing apparatus.