The Solaris 2.4 through Solaris 7 software environments and the Online: Disk Suite 3.0 or Solstice DiskSuite software support a log-based extension to the standard UNIX file system, which works like a disk-based Prestoserve NFS accelerator.
In addition to the main file system disk, a small (typically 10 Mbytes) section of disk is used as a sequential log for writes. This speeds up the same kind of operations as a Prestoserve NFS accelerator with two advantages:
In dual-machine high-available configurations, the Prestoserve NFS accelerator cannot be used. The log can be shared so that it can be used.
After an operating system crash, the fsck of the log-based file system involves a sequential read of the log only. The sequential read of the log is almost instantaneous, even on very large file systems.
You cannot use the Prestoserve NFS accelerator and the log on the same file system.