Red Hat Enterprise Linux 5 Logical Volume Manager Administrator's Guide

Below you will find brief information for Logical Volume Manager Red Hat Enterprise Linux 5. This guide provides instructions for administrators to take advantage of the features that LVM provides, such as flexible capacity, resizable storage pools, online data relocation, convenient device naming, efficient disk striping, mirroring volumes, and volume snapshots.

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Red Hat Ent erprise Linux 5 Logical Volume Manager Administ rat ion
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Device:
Blocksize:
Filesystem Size:
Journals:
Resource Groups:
Locking Protocol:
Lock Table:
/dev/new_vol_group/new_logical_volume
4096
491460
1
8
lock_nolock
Syncing...
All Done
The following commands mount the logical volume and report the file system disk space usage.
# mount /dev/new_vol_group/new_logical_volume /mnt
# df
Filesystem
1K-blocks
Used Available Use% Mounted on
/dev/new_vol_group/new_logical_volume
1965840
20
1965820
1% /mnt
5.2. Creat ing a St riped Logical Volume
This example creates an LVM striped logical volume called striped_logical_volume that stripes
data across the disks at /dev/sda1, /dev/sdb1, and /dev/sdc1.
5.2.1. Creat ing t he Physical Volumes
Label the disks you will use in the volume groups as LVM physical volumes.
Warning
This command destroys any data on /dev/sda1, /dev/sdb1, and /dev/sdc1.
# pvcreate
Physical
Physical
Physical
/dev/sda1 /dev/sdb1 /dev/sdc1
volume &quot;/dev/sda1&quot; successfully created
volume &quot;/dev/sdb1&quot; successfully created
volume &quot;/dev/sdc1&quot; successfully created
5.2.2. Creat ing t he Volume Group
The following command creates the volume group volgroup01.
# vgcreate volgroup01 /dev/sda1 /dev/sdb1 /dev/sdc1
Volume group &quot;volgroup01&quot; successfully created
You can use the vgs command to display the attributes of the new volume group.
# vgs
VG
volgroup01
#PV #LV #SN Attr
VSize VFree
3
0
0 wz--n- 51.45G 51.45G
5.2.3. Creat ing t he Logical Volume
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Key features

Flexible capacity
Resizable storage pools
Online data relocation
Convenient device naming
Efficient disk striping
Mirroring volumes
Volume Snapshots

Frequently asked questions

LVM is a layer of abstraction over physical storage, allowing administrators to create logical storage volumes. This provides much greater flexibility in a number of ways than using physical storage directly.

Using LVM provides the following advantages: flexible capacity, resizable storage pools, online data relocation, convenient device naming, disk striping, mirroring volumes, and volume snapshots.

The Clustered Logical Volume Manager (CLVM) is a set of clustering extensions to LVM. These extensions allow a cluster of computers to manage shared storage (for example, on a SAN) using LVM.