Logical Volume Management in Linux?

[Brief-Wishbone]

https://systemzone.net/lvm-management-in-centos-red-hat-7-linux/

For eg: this tutorial

 

I'm unable to continue from here.

 

>From the above output we can see that there is a physical volume (PV) named /dev/sda2 and the PV is a partition of the first disk drive. We can also see that there is a volume group (VG) named centos on this physical volume.

 

>Now we want to add another Hard Disk Drive to increase our volume group. The new HDD will be the second Disk Drive and the device location will be /dev/sdb. To find your newly added drive location, issue the following command.

 

I'm wondering what're the preriquisites to start a LVM tutorial. 

 

Can you share a step by step guide to use set up LVM and test some cases?

 

https://www.linuxtechi.com/how-to-create-lvm-partition-in-linux/

It includes prerequisites as:

 

>Raw disk attached to Linux system

 

What does this mean? How do I do it in my system? I can't attach a totally new disk as I don't have money for that at the moment.

 

How do I do it?

 

[Brief-Wishbone]

I'm on centos in a vmware workstation pro.

[Brief-Wishbone]

I've got it. I just needed to add a new disk using vmware workstation pro. And continue that article on linustechi.com