This feature is new in the Solaris 9 12/02 release.
UFS logging enables faster system reboots. Because the file system transactions are already stored, checking the file system is not required if the file system is already consistent.
In addition, the performance of UFS logging improves or exceeds the level of performance of nonlogging file systems in this Solaris release. Results of the Standard Performance Evaluation Corporation system file server (SPECsfs) benchmark show that the performance of NFS-mounted file systems that have logging enabled equals the level of non-UFS logging performance. In some I/O-bound configurations, logging UFS file systems exceed the performance of nonlogging UFS file systems by approximately 25 percent. In other tests, performance of logging UFS file systems is 12 times better than the performance of nonlogging UFS file systems.