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:
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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how to create vg? or files system