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公开(公告)号：BR9002251A
公开(公告)日：1991-08-13
申请号：BR9002251
申请日：1990-05-14
Applicant: IBM
Inventor： JOHNSON DONAVON WILLIAM , MORGAN STEPHEN PAUL , SMITH TODD ALLEN
Abstract: The disclosed arrangement maintains the latest file attributes such as file size, modify time, and access time, at the server data processing system in a distributed data processing system. The server data processing system combines information requested from the client data processing system that has permission to write to the file with information periodically received from other client data processing systems that may be extending the same file by mapping the file into their own virtual address space. In this way, the server can maintain the latest file size attribute even when some clients are extending the file through system calls and other clients are extending the file through mapped access. To maintain a latest modify time and access time, the server keeps a modify count and access count. The client data processing systems periodically send to the server data processing the modify count and access count that have been incremented whenever the client data processing system modifies and accesses the file. The server data processing system compares the counts at the server with the counts received from the clients to determine a latest corresponding modify time and access time.
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公开(公告)号：DE3852324D1
公开(公告)日：1995-01-19
申请号：DE3852324
申请日：1988-01-26
Applicant: IBM
IPC: G06F13/00 , G06F9/46 , G06F15/16 , G06F15/177 , H04L29/00
Abstract: Network management system having an efficient message handling technique implemented in AIX, an operating system derived from UNIX System V, for use in a distributed services network comprising a plurality of multi-processing , multi-tasking nodes (A,B,C) among which interprocess communication occurs via queues, the actual node locations of which are transparent at the application interface.
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公开(公告)号：BR9002270A
公开(公告)日：1991-08-06
申请号：BR9002270
申请日：1990-05-15
Applicant: IBM
Inventor： JOHNSON DONAVON WILLIAM , MORGAN STEPHEN PAUL , SMITH TODD ALLEN
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Patent Agency Ranking
公开(公告)号：HK71284A
公开(公告)日：1984-09-21
申请号：HK71284
申请日：1984-09-13
Applicant: IBM
Inventor： COCKERILL WILLIAM CLYDE , HORNUNG LOUIS MICHAEL , JOHNSON DONAVON WILLIAM , URBA RICHARD ALAN
Abstract: Logic circuitry is provided for controlling the transfer of data between 1) a low cost pipelined processor and its associated memory, 2) between the processor and input/output devices, and 3) between the input/output devices and memory. A plurality of unidirectional busses are provided to interface the processor and memory and a bidirectional buss is provided to interface with the input/output devices. The logic circuitry provides a control function to steer data over the proper buss structures interconnecting the processor, the memory and the input/output devices and provides those interconnections in a manner which allows the processor to overlap input and output functions.
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公开(公告)号：DE69031926D1
公开(公告)日：1998-02-19
申请号：DE69031926
申请日：1990-04-10
Applicant: IBM
Inventor： JOHNSON DONAVON WILLIAM , MORGAN STEPHEN PAUL , SMITH TODD ALLEN
Abstract: The disclosed arrangement maintains the latest file attributes such as file size, modify time, and access time, at the server data processing system in a distributed data processing system. The server data processing system combines information requested from the client data processing system that has permission to write to the file with information periodically received from other client data processing systems that may be extending the same file by mapping the file into their own virtual address space. In this way, the server can maintain the latest file size attribute even when some clients are extending the file through system calls and other clients are extending the file through mapped access. To maintain a latest modify time and access time, the server keeps a modify count and access count. The client data processing systems periodically send to the server data processing the modify count and access count that have been incremented whenever the client data processing system modifies and accesses the file. The server data processing system compares the counts at the server with the counts received from the clients to determine a latest corresponding modify time and access time.
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公开(公告)号：DE3855260T2
公开(公告)日：1996-12-12
申请号：DE3855260
申请日：1988-01-26
Applicant: IBM
Inventor： JOHNSON DONAVON WILLIAM , NEWMAN GROVER HERBERT , SHAHEN-GOUDA AMAL AHMED , SAUER CHARLES HERBERT , SMITH TODD ALLEN
Abstract: A system and method for accessing remote files (5) in a distributed networking environment . To reduce the network traffic overhead when files at other nodes are accessed, and to preserve the file system semantics, i.e. the file integrity, the accessing of the various files are managed by file synchronization modes. A file is given a first synchronization mode if a file is open at only one node for either read or write access. A file is given a second synchronization mode if a file is opened for read only access at any node. A file is given a third synchronization mode if the file is open for read access in more than one node, and at least one node has the file open for write access. If a file is in either the first or second synchronization mode, the client node (B), which is the node accessing the file , uses a client cache (12B) within its operating system to store the file. All read and writes are then sent to this cache. If a file is in the third mode, all read and write requests must go to the server node (A) where the file resides. The node accessing the file does not use the cache in its operating system to access the file data this third mode. The client cache is managed such that all read and write requests access the client cache in the first and second synchronization modes. In the third synchronization mode, the client cache is not used. In this way, overall system performance is improved without sacrificing file integrity.
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公开(公告)号：BR8800632A
公开(公告)日：1988-09-27
申请号：BR8800632
申请日：1988-02-12
Applicant: IBM
Inventor： JOHNSON DONAVON WILLIAM , NEWMAN GROVER HERBERT , SAUER CHARLES HERBERT , SMITH TODD ALLEN , SHAHEEN-GOUDA AMAL AHMED
Abstract: A system and method for accessing remote files (5) in a distributed networking environment . To reduce the network traffic overhead when files at other nodes are accessed, and to preserve the file system semantics, i.e. the file integrity, the accessing of the various files are managed by file synchronization modes. A file is given a first synchronization mode if a file is open at only one node for either read or write access. A file is given a second synchronization mode if a file is opened for read only access at any node. A file is given a third synchronization mode if the file is open for read access in more than one node, and at least one node has the file open for write access. If a file is in either the first or second synchronization mode, the client node (B), which is the node accessing the file , uses a client cache (12B) within its operating system to store the file. All read and writes are then sent to this cache. If a file is in the third mode, all read and write requests must go to the server node (A) where the file resides. The node accessing the file does not use the cache in its operating system to access the file data this third mode. The client cache is managed such that all read and write requests access the client cache in the first and second synchronization modes. In the third synchronization mode, the client cache is not used. In this way, overall system performance is improved without sacrificing file integrity.
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公开(公告)号：DE2723466A1
公开(公告)日：1977-12-22
申请号：DE2723466
申请日：1977-05-24
Applicant: IBM
Inventor： COCKERILL WILLIAM CLYDE , HORNUNG LOUIS MICHAEL , JOHNSON DONAVON WILLIAM , VRBA RICHARD ALAN
Abstract: Logic circuitry is provided for controlling the transfer of data between 1) a low cost pipelined processor and its associated memory, 2) between the processor and input/output devices, and 3) between the input/output devices and memory. A plurality of unidirectional busses are provided to interface the processor and memory and a bidirectional buss is provided to interface with the input/output devices. The logic circuitry provides a control function to steer data over the proper buss structures interconnecting the processor, the memory and the input/output devices and provides those interconnections in a manner which allows the processor to overlap input and output functions.
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