LVM HOWTO
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# 11.2. Creating a volume group

Use the 'vgcreate' program:

    # vgcreate my_volume_group /dev/hda1 /dev/hdb1

NOTE: If you are using LVM 1 with 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

LVM 2 does not have this restriction.

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