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Method and system for implenmenting buffer store uniformaty

A coherence and caching technology, applied in file systems, memory address/allocation/relocation, data processing applications, etc.

Inactive Publication Date: 2006-06-28
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, all modification operations to a data file are blocked during the entire synchronization process for that file

Method used

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  • Method and system for implenmenting buffer store uniformaty
  • Method and system for implenmenting buffer store uniformaty
  • Method and system for implenmenting buffer store uniformaty

Examples

Experimental program
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Embodiment Construction

[0018] overview

[0019] A near-instant copy of a data file's metadata is produced as part of a synchronization operation. A near-instant copy of the metadata records all changes to the metadata. To synchronize changes to metadata by a client with a copy maintained by a server node communicating with the client, a near-instant version of the client's metadata is sent to the server node for recording in the storage area network. In the process of recording this metadata change, an application executing on the client will continue to write changes to the file and record these changes in another near client metadata update before sending another metadata update to the server. in the immediate version. Thus, the use of creating and recording near-instant versions of client metadata changes supports recording changes to a file in parallel while allowing an application to continue writing changes to the file.

[0020] technical details

[0021] Figure 4 is a flowchart (150) of ...

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PUM

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Abstract

A system and method for supporting parallel logging of changes to a data file by a server while allowing an application to continue writing changes to the data file. In response to changes to a data file, a near-instant version of the file is created. Metadata reflecting changes to the data files are synchronized with versions of the files in the cache and recorded to persistent storage. In the process of recording metadata changes for a file, subsequent changes to the data file can proceed, and metadata reflecting the change can be recorded in a subsequent, near-instantaneous version of the file, which can also be Synchronized with the version of the metadata in persistent storage.

Description

technical field [0001] The present invention relates to metadata and synchronizing changes to metadata. More specifically, a modified synchronous operation is used to support asynchronous write operations by allowing clients to continue changing data files while the synchronous operation is in the process of updating metadata to the server. Background technique [0002] Figure 1 is a block diagram (10) of a prior art distributed system with shared persistent memory. The distributed system includes a storage area network (22) having a plurality of server nodes (30) and (40), a management node (50), and a plurality of client nodes (52) and (54). The storage area network (22) has file data space (24) and metadata space (26). Metadata space is reserved for servers (30) and (40). Each of the clients (52) and (54) has access to one or more objects stored in the file data space (24) of the storage area network (22), but not to the metadata space (26). When opening the content o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/08G06F17/30
CPCG06F16/10Y10S707/99938Y10S707/99952
Inventor R·C·拉斐尔R·K·普拉萨德V·尤朱里M·R·奈恩尼S·拉贾拉姆
Owner IBM CORP