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www.dell.com/powersolutions POWER SOLUTIONS

111

STORAGE ENVIRONMENT

Implementing Logical Volumes

on Linux-based Dell PowerEdge Servers

Sistina



Logical Volume Manager (LVM) software provides an abstraction layer that

allows administrators to work with logical volumes, helping to simplify storage

management. This article describes LVM and presents scenarios for using LVM to

resize storage volumes on Dell

™

PowerEdge

™

and PowerVault

™

systems running

the Red Hat



Linux



operating system.

ystem administrators who manage disk storage in net-

work environments face several challenges: ensuring

that data-intensive applications get the data they need

quickly, providing and organizing additional storage,

preserving data integrity, and backing up data regularly.

Scalable storage management software that enables admin-

istrators to reconfigure storage allocations dynamically in

response to changing enterprise needs can help meet

these challenges. One such open source product is the

Sistina

Logical Volume Manager (LVM), which is embed-

ded in the Linux

kernel. LVM combines physical disk

drives into easily manageable logical volumes and allows

online storage administration through tasks that are trans-

parent to the user and the application.

This article discusses the basic architecture and con-

figuration of LVM running under the Red Hat

Linux oper-

ating system. It also explains the steps for using LVM to

manage storage in Dell

™

PowerEdge

™

servers and Dell

PowerVault

™

systems.

Understanding LVM architecture

LVM comprises five basic structures: volume group (VG),

logical volume (LV), logical extent (LE), physical extent

(PE), and physical volume

(PV). A physical volume

is typically a hard disk or

a partition—for example,

a SCSI disk or a RAID

abstraction of a hard disk.

Each physical volume

comprises chunks of data,

called physical extents. All

physical extents within a

volume group are the

same size. In Figure 1,

the volume group, called

Vol_Grp00, is at the top

level of abstraction. This

group is obtained by

BY TESFAMARIAM MICHAEL AND JOSHUA GILES

LVM combines physical

disk drives into easily

manageable logical

volumes and allows

online storage adminis-

tration through tasks that

are transparent to the

user and the application.

1 2 3 4 5 6

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Pagina 1 - Implementing Logical Volumes

www.dell.com/powersolutions POWER SOLUTIONS111STORAGE ENVIRONMENTImplementing Logical Volumeson Linux-based Dell PowerEdge ServersSistinaLogical Volu

Pagina 2 - Conceptualizing LVM processes

mapping together the physical volumes /dev/sda2, /dev/sdc1,and /dev/sde5 to create logical volumes that form one manage-able group. In Figure 1, lvdat

Pagina 3 - STORAGE ENVIRONMENT

Implementing LVM during a Linux installation Because storage management is one of the main challengessystem administrators regularly face, most major

Pagina 4 - -f /dev/lvm00/home

and 512 MB. However, the installer limits this range to between1 MB and 64 MB.Managing and maintaining system storageOnce LVM is implemented during in

Pagina 5 - Figure A. LVM commands

7. Bring the logical volume online:mount /logical_volume_mounting_pointFor this scenario, enter:mount /home8. Verify that the added space is accounted

Pagina 6 - November 2003

STORAGE ENVIRONMENTPOWER SOLUTIONS November 2003116Scenario C: Adding more storageIf a Dell PowerEdge server lacks un-allocated or unused storage spac

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