add disk tests for virsh

active/software_virsh/virsh.md

@@ -22,6 +22,7 @@ Virtual Machine Management
     - [Create a Home Assistant VM](#create-a-home-assistant-vm)
   - [Snapshots](#snapshots)
   - [Creating and Attaching Disks](#creating-and-attaching-disks)
+    - [Disk Testing and Scripts](#disk-testing-and-scripts)
   - [Virt Builder](#virt-builder)
 
 ## Before you Begin
@@ -351,9 +352,14 @@ See [qemu qcow2 snapshots](/active/software_qemu/qemu.md#qcow2-snapshots)
 To create and attach one disk:
 
 ```bash
-export VM_NAME="cloud-init-test-fedora"
-export VM_DISK_NAME="test1"
-qemu-img create -f qcow2 /var/lib/libvirt/images/${VM_DISK_NAME}.qcow2 1G
+# QCOW
+qemu-img create -f qcow2 /var/lib/libvirt/images/my-disk.qcow2 1G
+
+# Raw (better performance, no snapshots or copy on write)
+qemu-img create -f raw /var/lib/libvirt/images/my-disk.raw 1G
+
+# Query disk info (like actual size on disk)
+qemu-img info /var/lib/libvirt/images/my-disk.raw
 
 virsh attach-disk ${VM_NAME} \
 --source /var/lib/libvirt/images/${VM_DISK_NAME} \
@@ -362,6 +368,8 @@ virsh attach-disk ${VM_NAME} \
 --live
 ```
 
+### Disk Testing and Scripts
+
 To create and attach multiple disks (for raid testing)
 
 ```bash