How to add a extra disk to running VM

common/docs/Add disk2VM.txt

+main server
+cd /var/lib/libvirt/images/
+qemu-img create -f raw external.img 100G
+virsh attach-disk test --source /var/lib/libvirt/images/external.img --target sdb --persistent
+
+
+On VM
+reboot
+fdisk -l
+
+
+cfdisk /dev/sdc (based on the name in fdisk -l)
+mkfs.ext4 /dev/sdc
+mkdir /mcz
+mount /dev/sdc /mcz
+
+add in /etc/fstab
+/dev/vda   /mcz   ext4    defaults    0 0
+
+
+cd mcz
+mv /opt/mcz/user_images .
+
+
+ln -s /mcz/user_images/ /opt/mcz/user_images
+ln -s /mcz/logs/ logs
+
+
+