disk showing busy

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http://serverfault.com – Want to create LV Group but when i unmount /dev/sda5 this showing [root@xen01 ~]# umount /dev/sda5 umount: /: device is busy umount: /: device is busy This means disk /dev/sda5 is busy and due to this i can't create phsical,logical volume on this disk. [root@xen01 ~]# pvcreate /dev/sda5 Can't open /dev/sda5 exclusively. Mounted filesystem? please anyone can tell me how i do this task it's urgent..? (HowTos)