|
|
 |
|
| |
NOTE: CentOS Enterprise Linux is built from the Red Hat Enterprise Linux source code. Other than logo and name changes CentOS Enterprise Linux is compatible with the equivalent Red Hat version. This document applies equally to both Red Hat and CentOS Enterprise Linux.
Chapter 8. LVM Configuration
LVM can be configured during the graphical installation process,
the text-based installation process, or during a kickstart
installation. You can use the utilities from the lvm package to create your own LVM configuration
post-installation, but these instructions focus on using Disk Druid during installation to complete this
task.
Read Chapter 7 Logical Volume
Manager (LVM) first to learn about LVM. An overview of the
steps required to configure LVM include:
-
Creating physical volumes from the hard
drives.
-
Creating volume groups from the
physical volumes.
-
Creating logical volumes from the
volume groups and assign the logical volumes mount points.
 |
Note |
| |
Although the following steps are illustrated during a GUI
installation, the same can be done during a text-based
installation.
|
Two 9.1 GB SCSI drives (/dev/sda and
/dev/sdb) are used in the following
examples. They detail how to create a simple configuration using a
single LVM volume group with associated logical volumes during
installation.
On the Disk Partitioning Setup screen,
select Automatically partition.
For Red Hat Enterprise Linux, LVM is the default method for disk
partitioning. If you do not wish to have LVM implemented, or if you
require RAID partitioning, manual disk partitioning through
Disk Druid is required.
The following properties make up the automatically created
configuration:
-
The /boot/ partition resides on its own
non-LVM partition. In the following example, it is the first
partition on the first drive (/dev/sda1).
Bootable partitions cannot reside on LVM
logical volumes.
-
A single LVM volume group (VolGroup00)
is created, which spans all selected drives and all remaining space
available. In the following example, the remainder of the first
drive (/dev/sda2), and the entire second
drive (/dev/sdb1) are allocated to the
volume group.
-
Two LVM logical volumes (LogVol00 and
LogVol01) are created from the newly
created spanned volume group. In the following example, the
recommended swap space is automatically calculated and assigned to
LogVol01, and the remainder is allocated
to the root file system, LogVol00.
|
Note |
| |
If enabling quotas are of interest to you, it may be best to
modify the automatic configuration to include other mount points,
such as /home/ or /var/, so that each file system has its own
independent quota configuration limits.
In most cases, the default automatic LVM partitioning is
sufficient, but advanced implementations could warrant modification
or manual configuration of the LVM partition tables.
|
|
Note |
| |
If you anticipate future memory upgrades, leaving some free
space in the volume group would allow for easy future expansion of
the swap space logical volume on the system; in which case, the
automatic LVM configuration should be modified to leave available
space for future growth.
|
|
|
|
