$ virsh pool-list

Name                 State      Autostart
-------------------------------------------
default              active     yes

$ pool-destroy default
Pool default destroyed

$ pool-undefine default
Pool default has been undefined

$ virsh pool-define-as --name default --type dir --target /media/work/kvm
Pool default defined

$ vrish pool-autostart default
Pool default marked as autostarted

$ virsh pool-start default
Pool default started

$ virsh pool-list
Name                 State      Autostart
-------------------------------------------
default              active     yes