JP2003005916A5 - - Google Patents

Claims (6)

In a disk control device for accessing a magnetic disk device by a host computer,
A host interface unit having an interface with the host computer;
A disk interface unit having an interface with the magnetic disk device;
A cache memory unit for temporarily storing data to be read from and written to the magnetic disk device;
A shared memory unit for storing control data of the disk controller,
A path for data transfer is provided between the cache memory unit and the shared memory unit,
Wherein the control data, through the shared memory unit, a disk controller, wherein the access and stored in the cache memory unit. The coupling of the cache memory unit, the host interface unit and the disk interface unit is a switch coupling,
2. The disk controller according to claim 1, wherein the shared memory unit, the host interface unit, and the disk interface unit are coupled directly.   2. The disk control device according to claim 1, wherein the data transfer path between the shared memory unit and the cache memory unit is a one-to-one connection.   2. The disk controller according to claim 1, wherein the connection between the shared memory unit and the cache memory unit through the data transfer path is a one-to-many connection. In a data access method of a disk control device for accessing a magnetic disk device by a host computer,
This disk controller
A host interface unit having an interface with the host computer;
A disk interface unit having an interface with the magnetic disk device;
A cache memory unit for temporarily storing data to be read from and written to the magnetic disk device;
A shared memory unit for storing control data of the disk controller,
Furthermore, in this disk controller, a data transfer path is provided between the cache memory unit and the shared memory unit,
A data access method for a disk control apparatus, wherein the control data for the disk control apparatus is stored and accessed in the cache memory section via the shared memory section. In a disk control device for accessing a magnetic disk device by a host computer,
A host interface unit having an interface with the host computer;
A disk interface unit having an interface with the magnetic disk device;
A cache memory unit for temporarily storing data to be read from and written to the magnetic disk device;
A shared memory unit for storing control data of the disk controller,
The host interface unit includes a host interface that handles an interface with the host computer, a microprocessor that controls data transfer, a cache memory access control unit that controls access to the cache memory unit, and the shared memory unit, It consists of a cache memory access control unit that performs access control of
The disk interface unit includes a drive interface that handles an interface with the magnetic disk device, a microprocessor that controls data transfer, a cache memory access control unit that controls access to the cache memory unit, and the shared memory unit And a cache memory access control unit that performs access control with
Each cache memory access control unit of the host interface unit and the disk interface unit is coupled to the cache memory unit via a crossbar switch,
The shared memory access control unit of each of the host interface unit and the disk interface unit is directly coupled to the shared memory unit ,
The cache memory unit includes a cache memory controller and a memory module,
The shared memory unit includes a shared memory controller and a memory module,
The cache memory controller and the shared memory controller are coupled by a cache memory / shared memory path,
The disk controller according to claim 1, wherein the cache memory controller and the shared memory controller transfer the control data through the cache memory / shared memory path and store the data in a memory module of the cache memory unit.