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

9.1.1 Is the capacity of the update log area sufficient?

In the GFS Local File System, writing data from the update log buffers in memory to the update log area on the disk is delayed as long as possible. The latest update log information for the same meta-data is written in order to avoid writing outdated log information to the update log area. To effectively delay the writing of log information, a sufficiently large update log area must be reserved on the disk.

As a general rule, reserve an update log area of 1-megabytes for a file system of 100 megabytes (sfxnewfs(1M) default).

The GFS Local File System records the actual and the average number of updates by way of the meta-data on the disk in a set of unique statistical information.

If file system performance is low and the average number of updates is close to 1, try to expand the update log area.