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

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

GFS Local File System attempts to avoid decreases in file system performance by writing to the update log area. However, I/O bottlenecks may nevertheless occur depending on operation states. In this case, create a partition for the update log area on a disk with relatively low I/O load and separate the I/O operations for the file system from those for the update log area in order to improve the performance of the file system.

When checking whether writing to the update log area causes an I/O bottleneck, check with the GFS Local File System-specific statistical command the number of I/O accesses per second to the update log area and the average waiting time. The amount of I/O accesses for the entire file system can also be investigated with this command.