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244 - Logical volume management(LVM)

Logical volume management(LVM) provides a higher-level view of the disk storage on a computer system than the traditional view of disks
and partitions. This gives the system administrator much more flexibility in allocating storage to applications and users.

Storage volumes created under the control of the logical volume manager can be resized and moved around
almost at will, although this may need some upgrading of file system tools.

The logical volume manager also allows management of storage volumes in user-defined groups,
allowing the system administrator to deal with sensibly named volume groups such as "development"
and "sales" rather than physical disk names such as "sda" and "sdb".

# /sbin/lvm
lvm> lvs
lvm> pvs
lvm> vgs
lvm> quit


    sda1   sdc1      (Physical Volumns on partitions or whole disks)                       
       \   /                                                                   
        \ /                                                                    
       diskvg                (Volume Group)                                                      
       /  |  \                                                                 
      /   |   \                                                                
  usrlv rootlv varlv     (Logical Volumns)
    |      |     |                                                             
 ext2  reiserfs  xfs    (filesystems)

# lvscan

# pvscan

# vgscan


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Story | by Dr. Radut