The delaylog and tmplog modes can significantly improve performance. The improvement over log mode is typically about 15 to 20 percent with delaylog; with tmplog, the improvement is even higher. Performance improvement varies, depending on the operations being performed and the workload. Read/write intensive loads should show less improvement, while file system structure intensive loads, such as mkdir, create, and rename, may show over 100 percent improvement. The best way to select a mode is to test representative system loads against the logging modes and compare the performance results.
The mount command automatically runs the VxFS fsck command to clean up the intent log if the mount command detects a dirty log in the file system. This functionality is only supported on file systems mounted on a Veritas Volume Manager (VxVM) volume.