Problem Executing "lvcreate" Command

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http://www.unix.com – Hi everyone, I use Fedora 17. I used gparted to created a dev/sdb2 partition. I then used vgextend to extend the volume group. The output of vgdisplay shows the condition of my volume group: Code: --- Volume group ---   VG Name              vg_data   System ID              Format                lvm2   Metadata Areas        2   Metadata Sequence No  86   VG Access            read/write (HowTos)