Logical Volume Manager (Lvm); Figure 83 Logical Volume Manager (Lvm) - Fujitsu ETERNUS DX S5 Series Design Manual

3. SAN Functions
Server Linkage Functions

Logical Volume Manager (LVM)

The Logical Volume Manager is a management function that groups the save areas in multiple drives and
partitions and manages these areas as one logical drive. Adding drives and expanding logical volumes can be
performed without stopping the system. This function can be used on UNIX OSs (includes Linux).
LVM has a snapshot function. This function obtains any logical volume data as a snapshot and saves the
snapshot as a different logical volume.
To use LUNs in the ETERNUS DX to configure an LVM, the LVM can be configured by registering LUNs in the
ETERNUS DX as physical volumes.
Figure 83 Logical Volume Manager (LVM)
Business server
LVM
ETERNUS DX
Volume group
Logical volume
Physical volume Physical volume
LUN LUN
RAID group #0 RAID group #1
159
Physical group
Physical volume
LUN
RAID group #2
Design Guide