公开(公告)号：JP2002229837A

公开(公告)日：2002-08-16

申请号：JP2001357196

申请日：2001-11-22

Applicant: IBM

Inventor： WANG-KNOP KUEI-YU ,  CURRAN ROBERT J ,  KANDADAI RADHA R

IPC: G06F15/16 ,  G06F11/14 ,  G06F12/00 ,  G06F15/177 ,  G06F17/30 ,  G11B20/10

Abstract: PROBLEM TO BE SOLVED: To provide a method for continuing node operation in a protocol based on quorum. SOLUTION: This method wherein a group comprising especially plural nodes includes only two nodes is especially useful in the state where communication to one node is damaged. A means for adding, to each node, an additional state instruction for showing whether a single node quorum operation is enabled or not is provided. A means for dispatching one node as a first node, and dispatching the other node as a second node for the purpose of time-out response is provided.

公开(公告)号：CA2242833C

公开(公告)日：2004-09-07

申请号：CA2242833

申请日：1998-07-09

Applicant: IBM

Inventor： KANDADAI RADHA R ,  KISH WILLIAM A ,  SCHMUCK FRANK B ,  SHMUELI BOAZ ,  WYLLIE JAMES C ,  ZLOTEK ANTHONY J ,  CURRAN ROBERT J

IPC: G06F17/30 ,  G06F15/16 ,  G06F15/167

Abstract: A computer system having a shared disk file system running on multiple computers each having their own instance of an operating system and being coupled for parallel dat a sharing access to files residing on network attached shared disks. Methods are provided for use as a parallel file system in a shared disk environment by use of a scalable directory service for the system with a stable cursor, a segmented allocation map. Dynamic prefetch and cached balance pools for multiple accesses improve the system. Extended file attributes and attribute value sharing are used for implementation of access control lists in a parallel file system. A metadata node manages file metadata for parallel read and write actions. For our system, tokens are used for metadata node selection and identification. Enhanced token modes for controlling file size, as well as smart caching of byte range tokens using file access patterns and a byte range lock algorithm using a by te range token interface are provided. Locking techniques reduce the overhead of a token manager whic h is also used in the file system recovery if a computer participating in the management of shared disks becomes unavailable or failed. Synchronous and asynchronous takeover of a metadata node occurs for correction of metadata which was under modification. Locks are not constantl y required to allocate new blocks on behalf of a user. Recoverable local shares for quota managemen t are provided. A quota server and a quota client are provided for each file system, and a quotacheck utility allows parallel environments with minimal interference to other applications which require the use of quotas.

公开(公告)号：DE69838367D1

公开(公告)日：2007-10-18

申请号：DE69838367

申请日：1998-06-17

Applicant: IBM

Inventor： SCHMUCK FRANK B ,  KANDADAI RADHA R ,  ZLOTEK ANTHONY J ,  CURRAN ROBERT J ,  KISH WILLIAM A

IPC: G06F9/46 ,  G06F11/14 ,  G06F17/30

Abstract: A computer system having a shared disk file system running on multiple computers each having their own instance of an operating system and being coupled for parallel data sharing access to files residing on network attached shared disks. Methods are provided for use as a parallel file system in a shared disk environment by use of a scalable directory service for the system with a stable cursor, a segmented allocation map. Dynamic prefetch and cached balance pools for multiple accesses improve the system. Extended file attributes are used for implementation of Access Control Lists in a parallel file system.

公开(公告)号：DE69838367T2

公开(公告)日：2008-05-29

申请号：DE69838367

申请日：1998-06-17

Applicant: IBM

Inventor： SCHMUCK FRANK B ,  KANDADAI RADHA R ,  ZLOTEK ANTHONY J ,  CURRAN ROBERT J ,  KISH WILLIAM A

IPC: G06F9/46 ,  G06F11/14 ,  G06F17/30

Abstract: A computer system having a shared disk file system running on multiple computers each having their own instance of an operating system and being coupled for parallel data sharing access to files residing on network attached shared disks. Methods are provided for use as a parallel file system in a shared disk environment by use of a scalable directory service for the system with a stable cursor, a segmented allocation map. Dynamic prefetch and cached balance pools for multiple accesses improve the system. Extended file attributes are used for implementation of Access Control Lists in a parallel file system.

公开(公告)号：CA2242833A1

公开(公告)日：1999-01-11

申请号：CA2242833

申请日：1998-07-09

Applicant: IBM

Inventor： SCHMUCK FRANK B ,  ZLOTEK ANTHONY J ,  KANDADAI RADHA R ,  WYLLIE JAMES C ,  CURRAN ROBERT J ,  KISH WILLIAM A ,  SHMUELI BOAZ

IPC: G06F17/30 ,  G06F15/16 ,  G06F15/167

Abstract: A computer system having a shared disk file system running on multiple computers each having their own instance of an operating system and being coupled for parallel data sh aring access to files residing on network attached shared disks. Methods are provided for use as a par allel file system in a shared disk environment by use of a scalable directory service for the system with a stable cursor, a segmented allocation map. Dynamic prefetch and cached balance pools for multip le accesses improve the system. Extended file attributes and attribute value sharing are use d for implementation of access control lists in a parallel file system. A metadata node manages file metadata for parallel read and write actions. For our system, tokens are used for metadata node select ion and identification. Enhanced token modes for controlling file size, as well as smart caching of byte range tokens using file access patterns and a byte range lock algorithm using a byte r ange token interface are provided. Locking techniques reduce the overhead of a token manager which is also used in the file system recovery if a computer participating in the management of shared dis ks becomes unavailable or failed. Synchronous and asynchronous takeover of a metadata node occurs for correction of metadata which was under modification. Locks are not constantly re quired to allocate new blocks on behalf of a user. Recoverable local shares for quota management ar e provided. A quota server and a quota client are provided for each file system, and a quota c heck utility allows parallel environments with minimal interference to other applications which requ ire the use of quotas.