/dev/mapper/VolGroup-lv_root 81% Without any data why that

General Help
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/dev/mapper/VolGroup-lv_root 81%

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That would depend on how you partitioned your disks and how you setup LVM2 , VolGroup-lv_root is presumably where you put your / partition, for how it works, try

http://www.redhat.com/magazine/009jul05/features/lvm2/