Question

60

Adding Disks With LVM

rated 0 times [ 60] [ 0] / answers: 1 / hits: 87489 / 3 Years ago, sun, may 30, 2021, 2:43:00

I'm sure this has been answered somewhere on here before (I even found kinda a guide here, but seemed to be a bit spotty and incomplete) but I was wondering if someone could assist me or at least point me in the right direction to get what I'm trying done accomplished.

Basically I installed Ubuntu 14.04 (via "Guided - use the entire disk and setup LVM") on a 20GB disk. I then physically added a clean 80GB disk to the machine, which it detects as 'sdb'.

Basically my question is, I want to be able to add/combine the allocated amount of space from the new disk (80GB) to my machine so that instead of showing two drives (20GB and 80GB), it simply shows one drive (100GB). I'm not worried about RAID or any other special add-ons.

I'm somewhat new to Linux, but understand that I need to use LVM to accomplish this.

If there is anyone who can help me out or link me to a helpful guide/tutorial, it would be very much appreciated! Not sure if this is needed either, but here is my 'fdisk -l' and '/etc/fstab' output:

fdisk output (shortened):

Disk /dev/sda: 21.5 GB, 21474836480 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1    *       2048      499711      248832   83  Linux

/dev/sda2          501758    41940991    20719617    5  Extended

/dev/sda5          501760    41940991    20719616   8e  Linux LVM



Disk /dev/sdb: 85.9 GB, 85899345920 bytes

Disk /dev/sdb doesn't contain a valid partition table



Disk /dev/mapper/ubuntu--vg-root: 20.4 GB, 20392706048 bytes

Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition table



Disk /dev/mapper/ubuntu--vg-swap_1: 801 MB, 801112064 bytes

Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition table

/etc/fstab (shortened):

# <file system> <mount point>   <type>  <options>       <dump>  <pass>

/dev/mapper/ubuntu--vg-root /               ext4    errors=remount-ro 0       1

# /boot was on /dev/sda1 during installation

UUID=26710773-7a64-4f34-a34e-0057cb1739d7 /boot           ext2    defaults        0       2

/dev/mapper/ubuntu--vg-swap_1 none            swap    sw              0       0

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answered 3 Years ago suspengn · Accepted Answer

After reviewing a combination of random guides and tutorials on the net, I was able to successfully add a disk to my Ubuntu Server 14.04 machine, and essentially set it up so I have multiple hard drives appearing as one single drive. To do this, I used LVM.

To help anyone else who might want to do this at some point, I will post here what I did.

These steps assume that you are essentially starting from scratch except having already installed Ubuntu on your machine (via "Guided - use the entire disk and setup LVM"), and physically added the additional disk. These steps may work if you have existing data on the machine but I can't say for sure if it would be safe to do this.

These commands assume the following information, and will vary depending on your setup:

Your new disk is 'sdb'
- This can be found by running ls /dev/sd*

That your volume group name is 'ubuntu-vg'
- This can be found by running vgdisplay

That your logical volume path is '/dev/ubuntu-vg/root'
- This can be found by running lvdisplay

Your new disk is 20GB
- Hopefully you know how big the disk is.

Install Logical Volume Manager (you may or may not need to do this).
```
sudo apt-get install system-config-lvm
```

Convert your new disk to a physical volume (in this case, the new disk is 'sdb').
```
sudo pvcreate /dev/sdb
```

Add the physical volume to the volume group via 'vgextend'.
```
sudo vgextend ubuntu-vg /dev/sdb
```

Allocate the physical volume to a logical volume (extend the volume size by your new disk size).
```
sudo lvextend -l +100%FREE /dev/ubuntu-vg/root
```

Resize the file system on the logical volume so it uses the additional space.
```
sudo resize2fs /dev/ubuntu-vg/root
```

That should do it. Five simple steps! You also don't have to reboot. Just run df -h and your new disk space should show allocated correctly, as well as any webapps you may be running will pick up the new disk space amount.