公开(公告)号：DE3850979T2

公开(公告)日：1995-03-16

申请号：DE3850979

申请日：1988-01-26

Applicant: IBM

Inventor： JOHNSON DONOVAN WILLIAM ,  LOUCKS LARRY KEITH ,  SAUER CHARLES HERBERT ,  SMITH TODD ALLEN

IPC: G06F12/00 ,  H04L29/00 ,  G06F15/16

Abstract: An improvement is disclosed to the conventional single node operating system to provide a single system interface to a user although multiple independent nodes (A,B,C) are involved. The improvement comprises a technique for creating a single set of master system files. These master system files define the system characteristics that a user at any node in the system can expect to have. The master system files are mounted remotely from each of the nodes of the system and a local copy of the master system files is kept locally reflecting the current contents of the master system file. If a master file is not available, the local copy is used in read only mode until the node containing the master is available. In addition, each user has its own file tree organization that dictates the necessary remote mounts of directories to enable a user logged on to any node to have the same view of the system that would be obtained from any other node in the system by that user.

公开(公告)号：DE3855260D1

公开(公告)日：1996-06-13

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

IPC: G06F12/00 ,  G06F12/08 ,  G06F15/16 ,  G06F17/30 ,  G06F9/46

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.

公开(公告)号：DE3850979D1

公开(公告)日：1994-09-15

申请号：DE3850979

申请日：1988-01-26

Applicant: IBM

Inventor： JOHNSON DONOVAN WILLIAM ,  LOUCKS LARRY KEITH ,  SAUER CHARLES HERBERT ,  SMITH TODD ALLEN

IPC: G06F12/00 ,  H04L29/00 ,  G06F15/16

Abstract: An improvement is disclosed to the conventional single node operating system to provide a single system interface to a user although multiple independent nodes (A,B,C) are involved. The improvement comprises a technique for creating a single set of master system files. These master system files define the system characteristics that a user at any node in the system can expect to have. The master system files are mounted remotely from each of the nodes of the system and a local copy of the master system files is kept locally reflecting the current contents of the master system file. If a master file is not available, the local copy is used in read only mode until the node containing the master is available. In addition, each user has its own file tree organization that dictates the necessary remote mounts of directories to enable a user logged on to any node to have the same view of the system that would be obtained from any other node in the system by that user.

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

IPC: G06F12/00 ,  G06F12/08 ,  G06F15/16 ,  G06F17/30 ,  G06F9/46

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.

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

IPC: G06F12/00 ,  G06F12/08 ,  G06F15/16 ,  G06F17/30 ,  G06F12/02 ,  G06F9/00

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.