LVM HOWTO
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9.2. Creating a volume group

Use the 'vgcreate' program: 


# vgcreate my_volume_group /dev/hda1 /dev/hdb1
NOTE: If you are using devfs it is essential to use the full devfs name of the device rather than the symlinked name in /dev . so the above would be: 

# vgcreate my_volume_group /dev/ide/host0/bus0/target0/lun0/part1 \
                           /dev/ide/host0/bus0/target1/lun0/part1

You can also specify the extent size with this command if the default of 32MB is not suitable for you with the '-s' switch. In addition you can put some limits on the number of physical or logical volumes the volume can have.

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Initializing disks or disk partitions Up Activating a volume group