Adding additional storage to KVM VMs

Adding additional storage on KVM

Create the image

sudo qemu-img create -f raw s2-attach.img 100G

Copy and allocate blocks

sudo dd if=/dev/zero of=s2-attach.img bs=1M count=102400 status=progress

Attach disk

Note that the target should be either vda, vdb … sda or sdb may not get recognized.

virsh attach-disk {vm-name} --source <path to img> --target vda --persistent

Example
virsh attach-disk s2 --source /opt/aprabh/s2-attach.img --target vda --persistent

Login to VM

once attached login to VM and perform the below steps

fdisk /dev/vda

type p for new partition . Default would 1 and hit enter followed by selection of blocks. hit enter. once complete press “w” to write and sync changes

Format new partition

sudo mkfs.ext4 /dev/vda1

mkdir /vda1
mount /dev/vda1 /vda1

add to fstab

vim /etc/fstab

/dev/vdb1    /disk2    ext4     defaults    0 0

[ linux  kvm  ]