Solaris Express Community Release, build 34: A new file system monitoring tool, fsstat, is available to report file system operations. Activity can be reported by mount point or by file system type. The following example shows general ZFS file system activity.
$ fsstat zfs new name name attr attr lookup rddir read read write write file remov chng get set ops ops ops bytes ops bytes 7.82M 5.92M 2.76M 1.02G 3.32M 5.60G 87.0M 363M 1.86T 20.9M 251G zfs
For more information, see fsstat(1M).