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

9.1 Update Logs

In GFS Local File System, an update log that contains information on changes in the file system structure is written to the disk in order to support a high-speed recovery of the file system. This seems to suggest that GFS Local File System require more I/O operations than conventional file systems. However, the information on changes is actually written collectively and updating the entries on changes is delayed in order to reduce the volume of file data I/O. This makes it possible to achieve file system performance that is equal to or higher than the performance of a file system that uses no log file. In order to achieve this, check the update log characteristics and actual accesses of the file system with respect to the following questions:

1. Is the capacity of the update log area sufficient?
2. Is the update log area too large?
3. Is it better to allocate the update log area to another partition?

How to check the above questions and what actions are to be taken depending on the outcome is described below:

When the settings for the update log area are changed, the file system will be re-created with sfxnewfs(1M).

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9.1.1 Is the capacity of the update log area sufficient?

9.1.2 Is the update log area too large?

9.1.3 Is it better to allocate the update log area to another partition?