It is advisable to unmount any user VxFS file systems before uninstalling VxFS to help smooth uninstallation of VxVM package if VxFS file system is mounted on VxVM volumes. System partitions need not be unmounted as part of this operation. After you remove the VRTSvxfs package, VxFS file systems versions greater than those supported by OnlineJFS bundled with the HP-UX operating system are not mountable or accessible until another VRTSvxfs package supporting them is installed.
To unmount a file system
Check if any VxFS file systems are mounted.
# cat /etc/mnttab | grep vxfs
Unmount any file systems that are not system partitions.
# umount special | mount_point
Specify the file system to be unmounted as a mount_point or special (the device on which the file system resides).
See the umount_vxfs(1M) manual page.
If using VxFS file system, system partitions need not be unmounted.