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Adding HDD to KVM/Virtual Machine.

Adding HDD to Virtual Machine.

Steps to create virtio HDD.
  1. First Create a image using qemu-img command.
  2. Add image to VM as a virtio HDD.
  3. This will appear as /dev/vda in the VM, format it using the mke2fs command.
  4. Add to /etc/fstab, so that the device can be mounted on boot up.
Details below.

First Create a image using qemu-img command.

Below is the command to create image.
[ahmed@ahmed-server ~]# qemu-img create VM-1-NEW-HDD.img 100G
This will create a HDD with 100GB disk.

Add image to VM as a virtio HDD.

Method 1 - Adding image from virt-manager UI.

Steps to Adding from the UI.
  1. Select a VM, right-click -> open.
  2. Next on the screen select view -> details.
  3. In the new window select Add Hardware -> Storage -> select managed or other existing storage.
    • Select Device Type : virtio
    • Select Storage Format : raw
'Adding New HDD'
After Adding the HDD we can see it as below.
'After Adding HDD'

Method 2 - Adding image using virsh command.

To edit the VM configuration use below command.
[ahmed@ahmed-server ~]# virsh edit VM-1
Format 
virsh edit
To add the image to the server add the below xml tag.
<disk type='file' device='disk'>
  <driver name='qemu' type='raw' cache='none'/>
  <source file='/virtual_machines/images/VM-1-ADD.img'/>
  <target dev='vda' bus='virtio'/>
  <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
Now reboot the VM, after restart you will see the new device.
[ahmed@ahmed-server ~]# fdisk -l
'fdisk output'

Added image will appear as /dev/vda in the VM, format it using the mke2fs command.

Before we mount the device we need to format the device.
[ahmed@ahmed-server ~]# mke2fs -j /dev/vda
This will format the device.

Add to /etc/fstab, so that the device can be mounted on boot up.

# /etc/fstab 
# 
# Column Details here : http://man7.org/linux/man-pages/man5/fstab.5.html          
# ------------------------------------------------------------------
/dev/vda            /data            ext3        defaults    0 0
Now we can check by mounting.
[ahmed@ahmed-server ~]# mount -a
Check by running below command.
[ahmed@ahmed-server ~]# df -h
'DF OUTPUT'

Useful Links.

http://xmodulo.com/install-configure-kvm-centos.html
http://www.cyberciti.biz/faq/kvm-virtualization-in-redhat-centos-scientific-linux-6/
https://www.howtoforge.com/vnc-server-installation-centos-6.5
http://wiki.centos.org/HowTos/KVM
https://www.howtoforge.com/virtualization-with-kvm-on-a-centos-6.4-server-p4
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualization/sect-Virtualization-Virtualized_block_devices-Adding_storage_devices_to_guests.html
http://unix.stackexchange.com/questions/92967/how-to-add-extra-disks-on-kvm-based-vm
http://www.techotopia.com/index.php/Adding_a_New_Disk_Drive_to_a_CentOS_6_System
http://blog.zwiegnet.com/linux-server/add-new-hard-drive-to-centos-linux/
http://man7.org/linux/man-pages/man5/fstab.5.html
​
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