Computer system with a reduced number of command end interrupts from auxiliary memory unit and method of reducing the number of command end interrupts
First Claim
1. A computer system comprising:
- a host machine having a memory and a CPU which includes interrupt handling feature;
an auxiliary memory unit for recording and reproducing data; and
an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit;
said CPU of said host machine includes;
means for generating a plurality of commands for designating access to said auxiliary memory unit, andrelation means, responsive to at least one command, for grouping a plurality of said commands according to type for designating access to said auxiliary memory unit, into at least one group and for supplying said input/output unit with said commands independently of one another;
said input/output unit includes;
access execution means for executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another by said CPU, andnotification means for notifying said CPU by a single interruption that execution of the commands of said one group has been terminated when the accesses designated by all commands belonging to said one group are found to have been terminated.
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Accused Products
Abstract
A computer system which includes a host machine having a memory and a CPU with an interrupt handling feature, an auxiliary memory unit for recording and reproducing data and an input/output unit for permitting data input and output between the host machine and the auxiliary memory unit. The CPU of the host machine generates a plurality of commands for designating access to the auxiliary unit, in response to at least one command, groups a plurality of the commands for designating access to the auxiliary memory unit, into at least one group and supplies the input/output unit with the commands independently of one another. The input/output unit executes access to the auxiliary memory unit as designated by each of the commands of one group supplied independently of one another by the CPU, and notifies the CPU by a single interruption that execution of the commands of the one group has been terminated when the accesses designated by all commands belonging to the one group have been terminated.
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Citations
51 Claims
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1. A computer system comprising:
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a host machine having a memory and a CPU which includes interrupt handling feature; an auxiliary memory unit for recording and reproducing data; and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit; said CPU of said host machine includes; means for generating a plurality of commands for designating access to said auxiliary memory unit, and relation means, responsive to at least one command, for grouping a plurality of said commands according to type for designating access to said auxiliary memory unit, into at least one group and for supplying said input/output unit with said commands independently of one another; said input/output unit includes; access execution means for executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another by said CPU, and notification means for notifying said CPU by a single interruption that execution of the commands of said one group has been terminated when the accesses designated by all commands belonging to said one group are found to have been terminated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An input/output unit for permitting data input and output between a host machine and an auxiliary memory unit, comprising:
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information generation means for generating information representing corresponding relations between each of a plurality of commands supplied from said host machine and a group to which said command belongs based on identification information for identifying the group to which said command belongs, said identification information being attached to said commands supplied from said host machine to said input/output unit; access execution means for executing access to said auxiliary memory unit as designated by each of said commands supplied from said host machine to said input/output unit included in one group; and notification means for notifying said CPU by a single interruption that processing of said one group has been terminated when accesses designated by all commands belonging to said one group have been terminated.
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18. An input/output unit for permitting data input and output between a host machine and an auxiliary memory unit, comprising:
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access execution means for executing access to said auxiliary memory unit as designated by commands supplied from said host machine to said input/output unit, the commands being grouped into at least one group; and notification means for notifying said host machine by a single interruption that processing of one group of said at least one group has been terminated when accesses designated by all commands belonging to said one have been terminated based on corresponding relation between said one group and commands belonging to said one group.
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19. An access method for use in a computer system including a host machine having a memory and a CPU with an interrupt handling feature;
- an auxiliary memory unit for recording and reproducing data, and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit, said access method comprising the steps of;
generating a plurality of commands for designating access to said auxiliary unit; in response to at least one command, grouping a plurality of said commands for designating access to said auxiliary memory unit, into at least one group; supplying said input/output unit with said commands independently of one another; executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another; and notifying said CPU by a single interruption that execution of the commands of said one group have been terminated when the accesses designated by all commands belonging to said one group have been terminated. - View Dependent Claims (20, 21, 22, 23)
- an auxiliary memory unit for recording and reproducing data, and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit, said access method comprising the steps of;
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24. A computer system comprising:
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a host machine having a memory and a CPU with an interrupt handling facility; an auxiliary memory unit for recording and reproducing data; and
an input/output unit for allowing data to be exchanged between said host machine and said auxiliary memory unit,wherein said CPU of said host machine includes; a means for generating a plurality of independent commands each requesting an access to said auxiliary memory unit, and a relation setting means for setting a relation between at least one of said commands and a group composed of at least one of said commands each requesting an access to said auxiliary memory unit so as to allow an end report of said group to be received as a single interrupt, and for issuing at least one of said commands related to groups independently of each other to said input/output unit without regard to groups to which said commands pertain, and said input/output unit includes; an access execution means for making accesses to said auxiliary memory unit as requested by said commands issued by said CPU independently of each other for requesting said accesses to said auxiliary memory unit concurrently at the same time by determining an execution order of said commands without regard to groups to which said commands pertain; and a notification means which is used for terminating a group and notifying said CPU by a single interrupt that said group has been terminated when an end of execution of all commands pertains to said group is identified. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A computer system comprising:
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a host machine having a memory and a CPU which includes interrupt handling feature; an auxiliary memory unit for recording and reproducing data; and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit; said CPU of said host machine including; means for generating a plurality of commands for designating access to said auxiliary unit, relation means, responsive to at least one command, for grouping a plurality of said commands for designating access to said auxiliary memory unit, into at least one group and for supplying said input/output unit with said commands independently of one another, command generation means, respective to a disc array command for designating access to the disc array unit for writing new data thereto, for generating a new data write command for designating access to said data disc drives for writing new data thereto, a current data read command for designating access to said data disc drives for reading current data therefrom, said current data being updated by access to said data disc drives to write new data thereto, a current parity read command for designating access to said at least one parity disc drive for reading current parity data therefrom, said current parity data corresponding to data in said data disc drives which is updated by access to said data disc drives for writing new data thereto, and a new parity write command for designating access to said parity disc drive for writing new parity data thereto, and new parity data corresponding to said new data which is updated by access to said data disc drives for writing new data thereto, and a parity generation unit for generating new parity data, said relation means grouping said current data read command and said current parity read command into a single group and supplying as a first group said current data read command and said current parity read command to said input/output unit, thereafter grouping into a single group said new data write command and said new parity write command when said parity generation unit generates new parity data to be written by use of said new parity write command and supplying as a second group said new data write command and said new parity write command to said input/output unit; said parity generation unit exclusive-OR'"'"'ing said current data, said current parity data and said new data, said current data being read from said disc array unit by use of the supplied current data read command, said current parity data being read from said disc array unit by use of the supplied current parity read command, said new data being written by use of said new data write command, and a result of said exclusive-OR'"'"'ing being generated as new parity data to be written by use of said new parity write command; said input/output unit includes; access execution means for executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another by said CPU, and notification means for notifying said CPU by the single interruption that execution of the commands of said one group has been terminated when the accesses designated by all commands belonging to said one group are found to have been terminated; wherein said auxiliary memory unit is a RAID type disc array unit which includes a plurality of data disc drives for storing data, and at least one parity disc drive for storing parity data related to data stored at the same disc addresses in a plurality of data disc drives. - View Dependent Claims (41)
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42. A computer system comprising:
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a host machine having a memory and a CPU which includes an interrupt handling feature; an auxiliary memory unit for recording and reproducing data; and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit; said CPU of said host machine including; means for generating a plurality of commands for designating access to said auxiliary unit, relation means, responsive to at least one command, for grouping a plurality of said commands for designating access to said auxiliary memory unit, into at least one group and for supplying said input/output unit with said commands independently of one another, data write means for temporarily writing to a cache area in said memory data to be written to said auxiliary memory, and a write-back request unit for generating at an appropriate timing a plurality of commands for designating access to said auxiliary memory unit for writing thereto a plurality of data items previously written in said cache area; said relation means grouping into a single group at least part of the commands generated by said write-back request unit at said appropriate timing; and said input/output unit includes; access execution means for executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another by said CPU, and notification means for notifying said CPU by the single interruption that execution of the commands of said one group has been terminated when the accesses designated by all commands belonging to said one group are found to have been terminated. - View Dependent Claims (43)
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44. A computer system comprising:
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a host machine having a memory and a CPU which has an interrupt handling feature; an auxiliary memory unit for recording and reproducing data; and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit; said CPU of said host machine including; means for generating a plurality of commands for designating access to said auxiliary unit, relation means, responsive to at least one command, for grouping a plurality of said commands for designating access to said auxiliary memory unit, into at least one group and for supplying said input/output unit with said commands independently of one another, command generation means, responsive to a disc array command for designating access to the disc array unit for writing new data thereto, for generating a new data write command for designating access to said data disc drives for writing new data thereto, a current data read command for designating access to said data disc drives for reading current data therefrom, said current data being updated by access to said data disc drives for writing new data thereto, a current parity read command for designating access to said at least one parity disc drive for reading current parity data therefrom, said current parity data corresponding to that data in said data disc drives which is updated by the access to said data disc drives for writing new data thereto, and a new parity write command for designating access to said at least one parity disc drive for writing new parity data thereto, said new parity data corresponding to said new data which is updated by access to said data disc drives for writing new data thereto, and a parity generation unit for generating new parity data, said relation means supplies said current data read command to said input/output unit, supplies a current data write command to said input/output unit when said input/output unit has read current data from said disc arrays, thereafter groups into a single group a plurality of current parity read commands upon elapse of a predetermined period of time, supplies to said input/output unit said single group of current parity read commands, groups into a single group a plurality of new parity write commands for writing the new parity data generated by said parity generation unit, and supplies to said input/output unit said single group of new parity write commands, said parity generation unit including exclusive-OR calculation means for exclusive-OR'"'"'ing the current data and new data, said current data being read from said disc array unit by said input/output unit in accordance with the supplied current data read commands, said new data being written by said input/output unit in accordance with said new data write command;
exclusive-OR holding means for holding a result of said exclusive-OR'"'"'ing; and
new parity generation means for exclusive-OR'"'"'ing current and held parity data, said current parity data being read from said disc array unit in accordance with said current parity read commands, said new parity generation means further generating as new parity data a result of the exclusive-OR'"'"'ing of said current and said held parity data; andsaid input/output unit including access execution means for executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another by said CPU, and notification means for notifying said CPU by the single interruption that execution of the commands of said one group has been terminated when the accesses designated by all commands belonging to said one group are found to have been terminated, wherein said auxiliary memory unit is a RAID type disc array unit which includes a plurality of data disc drives for storing data, and at least one parity disc drive for storing parity data related to data stored at the same disc addresses in a plurality of said data disc drives. - View Dependent Claims (45)
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46. A computer system comprising:
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a host machine having a memory and a CPU which includes interrupt handling feature; an auxiliary memory unit for recording and reproducing data; and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit; said CPU of said host machine includes; means for generating a plurality of commands for designating access to said auxiliary unit, relation means, responsive to at least one command, for grouping a plurality of said commands for designating access to said auxiliary memory unit, into at least one group and for supplying said input/output unit with said commands independently of one another, means for storing in said memory information representing corresponding relations between each group of said at least one group and commands belonging to said each group, means for attaching to each command of each group of said at least one group identification information identifying the group to which said each command belongs, said identification information being supplied to said input/output unit along with said commands, and termination means for referring to said information stored in said memory and said commands belonging to said one group when said CPU is notified by said single interruption from said input/output unit that processing of said one group has been terminated, command generation means, responsive to a disc array command for designating access to the disc array unit for writing new data thereto, for generating a new data write command for designating access to said data disc drives for writing new data thereto, a current data read command for designating access to said data disc drives for reading current data therefrom, said current data being updated by access to said data disc drives to write new data thereto, a current parity read command for designating access to said at least one parity disc drive for reading current parity data therefrom, said current parity data corresponding to data in said data disc drives which is updated by access to said data disc drives for writing new data thereto, and a new parity write command for designating access to said parity disc drive for writing new parity data thereto, said new parity data corresponding to said new data which is updated by access to said data disc drives for writing new data thereto, and a parity generation unit for generating new parity data, said relation means grouping said current data read command and said current parity read command into a single group and supplying as a first group said current data read command and said current parity read command to said input/output unit, thereafter grouping into a single group said new data write command and said new parity write command when said parity generation unit generates new parity data to be written by use of said new parity write command and supplying as a second group said new data write command and said new parity write command to said input/output unit, and said parity generation unit exclusive-OR'"'"'ing said current data, said current parity data and said new data, said current data being read from said disc array unit by use of the supplied current data read command, said current parity data being read from said disc array unit by use of the supplied current parity read command, said new data being written by use of said new data write command, and a result of said exclusive-OR'"'"'ing being generated as new parity data to be written by use of said new parity write command; and said input/output unit includes; access execution means for executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another by said CPU, notification means for notifying said CPU by the single interruption that execution of the commands of said one group has been terminated when the accesses designated by all commands belonging to said one group are found to have been terminated, and information generation and storage means for generating and storing information representing corresponding relations between each of said commands independently supplied from said relation means and said one group to which said commands independently supplied from said relation means belongs based on said identification information attached to said commands independently supplied from said relation means; wherein said auxiliary memory unit is a RAID type disc array unit which includes a plurality of data disc drives for storing data, and at least one parity disc drive for storing parity data related to data stored at the same disc addresses in a plurality of data disc drives. - View Dependent Claims (47)
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48. A computer system comprising:
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a host machine having a memory and a CPU which includes interrupt handling feature; an auxiliary memory unit for recording and reproducing data; and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit; said CPU of said host machine including; means for generating a plurality of commands for designating access to said auxiliary unit, relation means, responsive to at least one command, for grouping a plurality of said commands for designating access to said auxiliary memory unit, into at least one group and for supplying said input/output unit with said commands independently of one another, means for storing in said memory information representing corresponding relations between each group of said at least one group and commands belonging to said each group, means for attaching to each command of each group of said at least one group identification information identifying the group to which said each command belongs, said identification information being supplied to said input/output unit along with said commands, termination means for referring to said information stored in said memory and said commands belonging to said one group when said CPU is notified by said single interruption from said input/output unit that processing of said one group has been terminated, data write means for temporarily writing to a cache area in said memory data to be written to said auxiliary memory unit, and a write-back request unit for generating at an appropriate timing a plurality of commands for designating access to said auxiliary memory unit for writing thereto a plurality of data items previously written in said cache area, said relation means grouping into a single group at least part of the commands generated by said write-back request unit at said appropriate timing; and said input/output unit includes; access execution means for executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another by said CPU, notification means for notifying said CPU by the single interruption that execution of the commands of said one group has been terminated when the accesses designated by all commands belonging to said one group are found to have been terminated, and information generation and storage means for generating and storing information representing corresponding relations between each of said commands independently supplied from said relation means and said one group to which said commands independently supplied from said relation means belongs based on said identification information attached to said commands independently supplied from said relation means. - View Dependent Claims (49)
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50. A computer system comprising:
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a host machine having a memory and a CPU which includes interrupt handling feature; an auxiliary memory unit for recording and reproducing data; and an input/output unit for permitting data input and output between said host machine and said auxiliary memory unit; said CPU of said host machine including; means for generating a plurality of commands for designating access to said auxiliary unit, relation means, responsive to at least one command, for grouping a plurality of said commands for designating access to said auxiliary memory unit, into at least one group and for supplying said input/output unit with said commands independently of one another, means for storing in said memory information representing corresponding relations between each group of said at least one group and commands belonging to said each group, means for attaching to each command of each group of said at least one group identification information identifying the group to which said each command belongs, said identification information being supplied to said input/output unit along with said commands, termination means for referring to said information stored in said memory and said commands belonging to said one group when said CPU is notified by said single interruption from said input/output unit that processing of said one group has been terminated, command generation means, responsive to a disc array command for designating access to the disc array unit for writing new data thereto, for generating a new data write command for designating access to said data disc drives for writing new data thereto, a current data read command for designating access to said data disc drives for reading current data therefrom, said current data being updated by access to said data disc drives for writing new data thereto, a current parity read command for designating access to said at least one parity disc drive for reading current parity data therefrom, said current parity data corresponding to that data in said data disc drives which is updated by the access to said data disc drives for writing new data thereto, and a new parity write command for designating access to said at least one parity disc drive for writing new parity data thereto, said new parity data corresponding to said new data which is updated by access to said data disc drives for writing new data thereto, and a parity generation unit for generating new parity data, said relation means supplies said current data read command to said input/output unit, supplies a current data write command to said input/output unit when said input/output unit has read current data from said disc arrays, thereafter groups into a single group a plurality of current parity read commands upon elapse of a predetermined period of time, supplies to said input/output unit said single group of current parity read commands, groups into a single group a plurality of new parity write commands for writing the new parity data generated by said parity generation unit, and supplies to said input/output unit said single group of new parity write commands, said parity generation unit including exclusive-OR calculation means for exclusive-OR'"'"'ing the current data and new data, said current data being read from said disc array unit by said input/output unit in accordance with the supplied current data read commands, said new data being written by said input/output unit in accordance with said new data write command;
exclusive-OR holding means for holding a result of said exclusive-OR'"'"'ing; and
new parity generation means for exclusive-OR'"'"'ing current and held parity data, said current parity data being read from said disc array unit in accordance with said current parity read commands, said new parity generation means further generating as new parity data a result of the exclusive-OR'"'"'ing of said current and said held parity data;said input/output unit includes; access execution means for executing access to said auxiliary memory unit as designated by each of the commands of one group of said at least one group supplied independently of one another by said CPU, notification means for notifying said CPU by the single interruption that execution of the commands of said one group has been terminated when the accesses designated by all commands belonging to said one group are found to have been terminated, and information generation and storage means for generating and storing information representing corresponding relations between each of said commands independently supplied from said relation means and said one group to which said commands independently supplied from said relation means belongs based on said identification information attached to said commands independently supplied from said relation means; wherein said auxiliary memory unit is a RAID type disc array unit which includes a plurality of data disc drives for storing data, and at least one parity disc drive for storing parity data related to data stored at the same disc addresses in a plurality of said data disc drives. - View Dependent Claims (51)
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Specification