How do I increase the capacity of my LVM  partitions in linux if I add another disk or raid array

You need to add the new physical volume, extend the volume groups, increase the logical volume and resize the file system

Create the Partition with id LVM Linux

sd(x) where x is the new disk a,b,c,d for this example I will sdc as it is the third drive I have added to the system

# fdisk /dev/sd(x)

Command (m for help): n

Command (m for help): p

Command (m for help): 1

Command (m for help): t

Command (m for help): 8e
Command (m for help): w

Device Boot      Start         End      Blocks   Id  System/dev/sdc1               1      243200  1953503968+  8e  Linux LVM

How to List Physical Volumes, Volume Groups, and Logical Volumes

Before we get started its a good idea to know how to list what we need to know.

# pvdisplay

# vgdisplay

# lvdisplay

Add the LVM Physical Volume

# pvcreate /dev/sdc1

Extend an Existing Volume Group

vg_1 is the volume I want to extend

# vgextend vg_1 /dev/sdc1

Extend an Existing Logical Volume

You have a lot of control on how much you want to add. For this example I want to add the entire amount available that I can grow this lvm lv by.

I am increasing the Logical Volume “lv_home”

# lvresize -l +100%FREE /dev/vg_1/lv_home

Extending logical volume lv_home to 5.40 TiB

Logical volume lv_home successfully resized

Resize the File System

Now lets resize our file system to include our newly added lvm space. We are doing this without umounting the partition.

resize2fs /dev/vg_1/lv_home

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/vg_1/lv_home is mounted on /home; on-line resizing required

old desc_blocks = 230, new_desc_blocks = 346

Performing an on-line resize of /dev/vg_backup1/lv_home to 1450352640 (4k) blocks.

Go get a coffee cause this is going to take a while!