PRIMECLUSTER Global File Services Configuration and Administration Guide 4.2 (Solaris(TM) Operating Environment)

3.4 Update Log Area

The update log area contains the history of updates that were made in the structure of the file system structure. This information is used to support high-speed file system recovery. Log data is overwritten cyclically.

The update log area contains information on the following events:

• i-node acquisition and release
• i-node information update
• Extent allocation and de-allocation
• V-data acquisition and release
• V-data update

The GFS Local File System ensures that information is written to the update log in advance each time the file system structure is updated. If a system error occurs, use fsck_sfxfs(1M) to invalidate or complete update operations to the file system for which execution was interrupted: This ensures that the file system stays consistent with the update log. The update log area of the GFS Local File System records only the updates that were made to the file system structure, but does not record any data from files.