Who Should Use Logical Volumes?

The following are some practical reasons for using logical volumes instead of traditional disks with sections or whole, non-partitioned disks:

Logical volumes are especially useful if your file system is large and likely to grow. Not only can you expand the size of your logical volumes if your needs change, you can also reduce their size as well.
So, for example, you might want to use logical volumes for large applications such as a database or a CAD/CAE application that cannot be contained on a single disk.
Logical volumes support increased data and system availability through a process called mirroring. (See Chapter 7 for more information.)
To use mirroring, you must have purchased and installed the separately orderable MirrorDisk/UX product, product number B2491A.
Logical volumes allow for disk striping, a process that can increase I/O performance. And, logical volumes are the only supported way of managing disk arrays since disk arrays present a large amount of storage and you will need help to divide it up. (See Chapter 8 for more information.)

To summarize: While hard partitions allow you to manage disk space more precisely than on a system without partitions, logical volumes will enable you to partition your disks in an even more flexible and efficient manner than using traditional disk sections. This is why logical volumes are the preferred method of managing your disks.

Who Should Use Logical Volumes?

Technical documentation

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