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

25.1.3 Should the update log area be separated and placed in another partition?

The GFS Shared File System ensures that writing to the update log area does not degrade file system performance. Depending on the operating state, however, I/O bottlenecks may occur.

If I/O bottlenecks occur, create a partition for the update log on a disk with a relatively low I/O load. File system performance can be increased by separating the I/O operations related to the file system from those related to the update log area.

To check whether writing to the update log area causes I/O bottlenecks, use the statistics command specific to the GFS Shared File System, sfcstat(1M). Determine the number of I/O operations issued to the update log area per second and the average wait time. This command can also be used to determine the number of I/O operations related to the entire file system.