![]() ![]() Contrast this with the administrator who just slices up a hard disk into partitions and places filesystems on them. He can even create a logical volume and filesystem which spans multiple disks. When a project ends, he can remove the space and put it back into the pool of free space. For instance, he can create dozens of small filesystems for different projects and add space to them as needed without (much) disruption. By creating virtual pools of space, an administrator can assign chunks of space based on the needs of a system’s users. For this reason, it is often run in conjunction with RAID, which can provide both of these. It is not intended to provide fault-tolerance or extraordinary performance. Logical Volume Management provides benefits in the areas of disk management and scalability. Note that many other vendors offer logical volume management that is substantially different than the OSF LVM presented here! For example, Sun ships an LVM from Veritas with its Solaris system. This also served as a base for the Linux implementation of LVM, which is covered here. One, created by the Open Software Foundation (OSF), was integrated into many UNIX operating systems, including Hewlett-Packard’s HP/UX, Compaq’s Digital/Tru64 UNIX, and IBM’s AIX. There are many different implementations of the general concept of Logical Volume Management. These may be used just like “regular” disks, with filesystems created on them, and mounted in the UNIX filesystem tree. These Volume Groups may then be subdivided into virtual disks called Logical Volumes (LVs). These often differ greatly, but all are based on the same fundamental goals and assumptions.Ī Logical Volume Manager (LVM) abstracts disk devices into “pools” of storage space called Volume Groups (VGs). Implementations of the Logical Volume Management concept are available for most UNIX Operating Systems. Logical Volume Management is a fundamental way to manage UNIX storage systems in a scalable, forward-thinking manner. It is intended to introduce the concepts of Logical Volume Management for UNIX through simple exercises performed in a Linux LVM environment. Leave a comment if anything is horribly out of date and I’ll fix it up! Note that, at one time, this entire walkthrough was ripped off and printed up in a major book on Linux storage. However, reading through it ten years later, I realize that it’s still relevant and interesting. This introductory walkthrough of the Logical Volume Manager for Linux was originally written in 1998. ![]()
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