Sets the size of image files. This applies to images creation and also validation tests (when checking that a image was properly created according to what was requested).
By default the image size is set to 10G:
image_size = 10G
But a VM can have other drives, backed by other image files (or block devices), with different sizes:
# Tests variants: - block_hotplug: install setup image_copy unattended_install.cdrom images += " stg" boot_drive_stg = no image_name_stg = storage image_size_stg = 1G
No other documentation currently references this configuration key.