Hi, just want to ask or the steps on how to unallocate space from my home partition. Currently im using centos 7 in a 500 GB HDD, (50 GB as root, 8 GB as swap and 407 GB as home)

Im planning to install another linux OS to make it dual OS. Since my home partition is 407 GB, i would like to unallocate around 250 GB and used it for the other OS? Is it possible? if yes may i know the steps? That would not affect my current OS? Thanks a lot.

By the way, my centos was installed as LVM. When i run lsblk under Type column, it is showing LVM.

The default CentOS install creates LVM as posted but also uses xfs as the filesystem. There isn't a tool to shrink an xfs partition so you need to copy the contents, resize the lv, create a new filesystem and then copy the data back.

It is a bit more complicated because you are using lvm since you need to recreate the home LV, and then resize the physical partition itself. Typically the default order is root,swap and then home so hopefully you do not need to mess with the other LVs. You also may need to consider if you are using legacy MBR and whether you need an extended partition or not.

Always have a good backup...

Strictly speaking, this is all more complicated because of the use of xfs. Were it (for example) ext4, the whole process would be straight-forward. LVM itself is designed to accommodate this type of situation.

Let's see all the output from this (copy-paste should work).