Subscribe to the feed

Disk management has always been one of the most important tasks that system administrators perform. Historically, this would involve a lot of pre-planning and precision. Logical Volume Manager (LVM) doesn't completely alleviate these concerns; however, it is a bit more forgiving if you make an error in your calculations or just decide to do something different in the future. LVM was written in 1998 and has been a powerful ally for sysadmins since that time.

So, what advantages does it offer? Well, the big thing for most people is that LVM allows for dynamic resizing. This means that a sysadmin can allocate more space for a volume on the fly. In the past, you would have to unmount the volume in order to change its properties; however, LVM only requires this when downsizing.

LVM architecture

LVM consists of three key pieces. At the heart of LVM, your physical volumes (PV) will act as your starting point. These are physical "block devices" that must be initialized for LVM use, using the pvcreate command. Once you have your physical volumes, we can combine those into a single volume group (VG) using the vgcreate command. The volume group takes on the full capacity of the combined devices and is seen as a single storage device. From here, we can create various types of logical volumes (LV) to suit our needs using the lvcreate command.

What's next?

If LVM sounds like something that you are interested in or is something you are looking to get started with, I have written a few articles to discuss the basics and configuration of each piece of the LVM puzzle. You will find step by step instructions with examples and even some light troubleshooting for each of the necessary commands! So dive right in and let us help you learn something new today!

[ Want to test your sysadmin skills? Take a skills assessment today. ]


About the author

Tyler is the Sr. Community Manager at Enable Sysadmin, a submarine veteran, and an all-round tech enthusiast! He was first introduced to Red Hat in 2012 by way of a Red Hat Enterprise Linux-based combat system inside the USS Georgia Missile Control Center. Now that he has surfaced, he lives with his wife and son near Raleigh, where he worked as a data storage engineer before finding his way to the Red Hat team. He has written numerous technical documents, from military procedures to knowledgebase articles and even some training curricula. In his free time, he blends a passion for hiking, climbing, and bushcraft with video games and computer building. He is loves to read and enjoy a scotch or bourbon. Find him on Twitter or on LinkedIn.

Read full bio
UI_Icon-Red_Hat-Close-A-Black-RGB

Browse by channel

automation icon

Automation

The latest on IT automation for tech, teams, and environments

AI icon

Artificial intelligence

Updates on the platforms that free customers to run AI workloads anywhere

open hybrid cloud icon

Open hybrid cloud

Explore how we build a more flexible future with hybrid cloud

security icon

Security

The latest on how we reduce risks across environments and technologies

edge icon

Edge computing

Updates on the platforms that simplify operations at the edge

Infrastructure icon

Infrastructure

The latest on the world’s leading enterprise Linux platform

application development icon

Applications

Inside our solutions to the toughest application challenges

Original series icon

Original shows

Entertaining stories from the makers and leaders in enterprise tech