What Is Lvm2; Additional Resources; Installed Documentation; Useful Websites - Red Hat ENTERPRISE LINUX 4 System Administration Manual

Chapter 7. Logical Volume Manager (LVM)
Figure 7.2. Logical Volumes
On the other hand, if a system is partitioned with the ext3 file system, the hard drive is divided into
partitions of defined sizes. If a partition becomes full, it is not easy to expand the size of the partition.
Even if the partition is moved to another hard drive, the original hard drive space has to be reallocated
as a different partition or not used.
LVM support must be compiled into the kernel, and the default Red Hat kernel is compiled with LVM
support.
To learn how to configure LVM during the installation process, refer to

7.2. What is LVM2?

LVM version 2, or LVM2, is the default for Red Hat Enterprise Linux, which uses the device mapper
driver contained in the 2.6 kernel. LVM2, which is almost completely compatible with the earlier LVM1
version, can be upgraded from versions of Red Hat Enterprise Linux running the 2.4 kernel.
Although upgrading from LVM1 to LVM2 is usually seamless, refer to
Resources"
for further details on more complex requirements and upgrading scenarios.

7.3. Additional Resources

Use these sources to learn more about LVM.

7.3.1. Installed Documentation

• rpm -qd lvm — This command shows all the documentation available from the lvm package,
including man pages.
• lvm help — This command shows all LVM commands available.

7.3.2. Useful Websites

http://sourceware.org/lvm2
•
and more.
74
— LVM2 webpage, which contains an overview, link to the mailing lists,
Chapter 8, LVM Configuration.
Section 7.3, "Additional