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Where do you want it mounted?
 The new disk needs to be accessible to the system 
and possibly users, so you would want to mount (attach) it to a directory on your 
filesystem where your users or your application will be able to use it. In the case of 
LVM, which we also discuss in this chapter, you're probably going to want to attach 
it to an existing storage group. You can come up with your own directory for use 
with the new volume, but I'll discuss a few common locations later on in this chapter. 
We'll discuss mounting and unmounting in the 
Mounting and unmounting volumes 
section.
Let's consider the answers to the first two questions. With regards to how much 
space you should add, you would want to research the needs of your application or 
organization and find a reasonable amount. In the case of physical disks, you don't 
really get a choice beyond deciding which disk to purchase. In the case of virtual 
disks, you're able to be more frugal, as you can add a small disk to meet your needs 
(you can always add more later).
The main benefit of LVM with virtual disks is being able to grow a filesystem 
without a server reboot. For example, you can start with a 30 GB volume and then 
expand it in increments of 10 GB by adding additional 10 GB virtual disks. This 
method is certainly better than adding a 200 GB volume all at once when you're not 
completely sure all that space will ever be used. LVM can also be used on physical 
servers as well, but would most likely require a reboot anyway since you'd have 
to open the case and physically attach a hard drive. Some servers allow for hot-
plugging, which gives you the ability to add/remove physical hard drives without 
powering off the server first, which is a great benefit to have.
It may be common knowledge to you by now, but the word 
filesystem is a term that can have multiple meanings on a Linux 
system depending on its context and may confuse newcomers. We 
use it primarily to refer to the entire file and directory structure 
(the Linux filesystem), but it's also used to refer to how a disk 
is formatted for use with the distribution (for example, the ext4 
filesystem).

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Managing Storage Volumes