Storage control apparatus

Abstract

A processor of a mainframe host is provided with a variable length/fixed length format conversion function, and furthermore, provided with a function capable of connecting with a disk array provided outside a frame of the mainframe host by a fixed length interface. As a result, data to which the mainframe host, a UNIX server, and a PC server separately access can be commonly stored into the disk array equipped with the fixed length format interface. An interface for connecting a mainframe unit to an open system, is made identical to another interface for connecting a disk array which commonly stores thereinto data accessed by, for example, a UNIX server and a PC server, to both the mainframe host and the open system. As a result, a management step number of the computer system can be reduced, and the computer system can be easily utilized.

What is claimed is:  
     
         1 . A computer system constituted by at least one mainframe host; more than at least one open system host; and a disk system having a frame independent from those of said mainframe host and said open system host, and storing thereinto data which is accessed by said mainframe host and second open system host, wherein: 
 said disk system comprises means including a fixed length format interface for connecting said mainframe host and said open system host thereto;    said open system host comprises means including a fixed length format interface for connecting said disk system thereto by;    said mainframe host comprises a plurality of processors and a main memory;    at least one processor among said plurality of processors comprises means for storing into said main memory, a read/write request issued in accordance with a variable length format; and    at least one processor among said plurality of processors comprises means for converting the read/write request issued in accordance with the variable length format into a fixed length format in accordance with a variable length format/fixed length format conversion function; and means for connecting said disk system therewith by the fixed length format interface.    
     
     
         2 . A computer system constituted by at least two mainframe host; at least one open system host; and a disk system having a frame independent from those of said mainframe hosts and said open system host, and storing thereinto data which is accessed by said mainframe host and second open system host, wherein: 
 said disk system comprises means including a fixed length format interface for connecting said mainframe hosts and said open system host thereto;    said open system host comprises means including a fixed length format interface for connecting said disk system thereto;    each of said mainframe hosts comprised a plurality of processors and a main memory;    at least one processor among said plurality of processors comprises means for storing into said main memory, a read/write request issued in accordance with a variable length format;    at least one processor among said plurality of processors comprises: 
 means for converting the read/write request issued in accordance with the variable length format into a fixed length format in accordance with a variable length format/fixed length format conversion function; and further for executing the converted read/write request;  
 means for storing partial data of said disk system into said main memory;  
 means for notifying that which data is updated by a write request to another mainframe host when the write request issued in accordance with the variable length format is processed;  
 means for receiving from another mainframe host information as to which data is updated by the write request, and thereby erasing data to be updated from said main memory; and  
 means for connecting said disk system thereto by the fixed length format interface.