Back to results
US 7,010,623 B2Granted
External storage subsystem
AssigneeHitachi, Ltd.
InventorYasuo Inoue
Life of this patent
Estimating the term…
Abstract
A plurality of independent cache units and nonvolatile memory units are provided in a disk controller located between a host (central processing unit) and a magnetic disk drive. A plurality of channel units for controlling the data transfer to and from the central processing unit and a plurality of control units for controlling the data transfer to and from the magnetic disk drive are independently connected to the cache units and the nonvolatile memory units through data buses and access lines.
Claims26
A storage system comprising:
- a plurality of channel units that transfers data sent from an upper-level system and transfers data to said upper-level system;
- a plurality of cache units which are coupled to said plurality of channel units and in which data sent from said plurality of channel units is stored;
- a control unit that is coupled to said cache units, and transfers or receives data to or from said cache units;
- a disk device in which data sent from said control unit is stored;
- at least one first path coupling a first channel unit of said channel units to a first cache unit of said plurality of cache units;
- at least one second path coupling said first channel unit to a second cache unit of said plurality of cache units and not being in common with said first path;
- at least one third path coupling a second channel unit of said channel units to said first cache unit;
- and
- at least one fourth path coupling said second channel unit to said second cache unit and not being in common with said third path.
6 more elements
A storage system comprising:
- a plurality of channel units that transfers data sent from an upper-level system and transfers data to said upper-level system;
- a plurality of cache units which are coupled to said plurality of channel units and in which data sent from said plurality of channel units is stored;
- a control unit that is coupled to said cache units, and transfers or receives data to or from said cache units;
- a disk device in which data sent from said control unit is stored;
- at least one first path coupling a first channel unit of said channel units to a first cache unit of said plurality of cache units;
- at least one second path coupling said first channel unit to a second cache unit of said plurality of cache units and not being in common with said first path;
- at least one third path coupling a second channel unit of said channel units to said first cache unit;
- and
- at least one fourth path coupling said second channel unit to said second cache unit and not being a same path as said third path.
6 more elements
Dependencies are inferred from the claim text.