SUNWcsu
fsirand installs random inode generation numbers on all the inodes on device special, and also installs a file system ID in the superblock. This helps increase the security of file systems exported by NFS .
fsirand must be used only on an unmounted file system that has been checked with fsck(1M) . The only exception is that it can be used on the root file system in single-user mode, if the system is immediately re-booted afterwards.