Difference between revisions of "Common Log File System (CLFS)"
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There are two types of logs: | There are two types of logs: | ||
| − | * dedicated logs; contains a single stream of log | + | * dedicated logs; contains a single stream of log records. |
| − | * multiplexed (or common ) logs; contains several streams of log records. | + | * multiplexed (or common) logs; contains several streams of log records. |
== Implementation == | == Implementation == | ||
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In Windows Vista the CLFS is implemented as a driver named: clfs.sys. User space equivalent functionality is provided by clfsw32.dll, which communicates to the driver by DeviceIoControl calls. | In Windows Vista the CLFS is implemented as a driver named: clfs.sys. User space equivalent functionality is provided by clfsw32.dll, which communicates to the driver by DeviceIoControl calls. | ||
| + | |||
| + | == Also see == | ||
| + | Windows Internals 5 by Mark E. Russinovich and David A. Solomon | ||
== External links == | == External links == | ||
Revision as of 04:05, 3 December 2010
The Common Log File System (CLFS) is a special purpose file (sub)system designed for transaction logging and/or recovery. The CLFS is not a file system in the traditional meaning of a disk file system, but more of a logical (special purpose) file system that operates in combination with a disk file system like NTFS.
Contents |
Overview
A CLFS log consists of a base log file (.blf) and one or more container files.
There are two types of logs:
- dedicated logs; contains a single stream of log records.
- multiplexed (or common) logs; contains several streams of log records.
Implementation
According to Wikipedia CLFS was introduced in Windows server 2003 R2.
In Windows Vista the CLFS is implemented as a driver named: clfs.sys. User space equivalent functionality is provided by clfsw32.dll, which communicates to the driver by DeviceIoControl calls.
Also see
Windows Internals 5 by Mark E. Russinovich and David A. Solomon
