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LVM Command.


pvcreate - initialize a disk or partition for use by LVM  
Example
Initialize partition #4 on the third SCSI disk and the entire fifth SCSI disk for later use by LVM:
pvcreate /dev/sdc4 /dev/sde
vgcreate - create a volume group  
EXAMPLES
To create a volume group named test_vg using physical volumes /dev/hdk1, /dev/hdl1, and /dev/hdm1 with default physical extent size of 4MB:
vgcreate test_vg /dev/sd[k-m]1
lvcreate - create a logical volume in an existing volume group  
Examples
lvcreate –L 10G –n lv01 testvg 
 
vgextend - add physical volumes to a volume group  
Examples
"vgextend vg00 /dev/sda4 /dev/sdn1" tries to extend the existing volume group "vg00" by the new physical volumes  "/dev/sdn1" and /dev/sda4".  

lvextend - extend the size of a logical volume
Examples
lvextend -L +54 /dev/vg01/lvol10