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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..?

user133916
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  • Well, what do you have mounted there? Try `mount | grep sda5` – Charles Oct 01 '12 at 06:51
  • out put showing [root@xen01 ~]# mount | grep sda5 /dev/sda5 on / type ext3 (rw) – user133916 Oct 01 '12 at 06:55
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    `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 01 '12 at 06:59
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    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 01 '12 at 07:04
  • ok thanx i'll try to resize this partition. – user133916 Oct 01 '12 at 07:05

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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.

Sly
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