https://serverfault.com/questions/840519/how-to-change-the-default-storage-pool-from-libvirt/840520#840520

Listing current pools:

virsh pool-list

Destroying pool:

virsh pool-destroy default

Undefine pool:

virsh pool-undefine default

Defining a new pool with name "default":

virsh pool-define-as --name foo--type dir --target /path/bar

Set pool to be started when libvirt daemons starts:

virsh pool-autostart default

Start pool:

virsh pool-start default