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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..?

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Well, what do you have mounted there? Try mount | grep sda5 – Charles Oct 1 '12 at 6:51
out put showing [root@xen01 ~]# mount | grep sda5 /dev/sda5 on / type ext3 (rw) – user133916 Oct 1 '12 at 6:55
sda5 is mounted as the root directory of your filesystem. You are not going to be able to use that partition without resizing the filesystem and then altering the partition sizes (read: adding another partition). That's risky at best when you're dealing with a normal filesystem, and utter insanity when you're dealing with the root filesystem. You need to reconsider your plan. – Charles Oct 1 '12 at 6:59
mount |grep /dev/sda /dev/sda5 on / type ext3 (rw) /dev/sda2 on /tmp type ext3 (rw,noexec,nosuid,nodev) /dev/sda1 on /boot type ext3 (rw) this showing root / directory is mounted on this drive how i can umount root from here? – user133916 Oct 1 '12 at 7:04
ok thanx i'll try to resize this partition. – user133916 Oct 1 '12 at 7:05

Looking at the comments in your question, it is showing that / is where /dev/sda5 is mounted. You're not going to be able to unmount the root filesystem, because it will always be busy as long as the system is booted from the /dev/sda5 partition. You can use a LiveCD to edit the partition to your liking, or boot into another Linux partition if you have one and then edit the partition.

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