SmartOS can be re-installed clean on a previously used system after removing the old persistent zpool made by the SmartOS installer.
This zpool is named "zones" by default.
|Migrate all important ZFS snapshots, VM datasets, KVM images, /usbkey/config NIC settings, or persistent SMF scripts that you want to keep onto another system. This procedure WILL DESTROY all the persistent information stored in ZFS on the system.|
Reboot SmartOS from media and choose the GRUB menu [Live 64-bit(noinstall)] option.
This disables the setup script and avoids importing and activating the persistent zpool.
Login and password are both "root" for single user (noinstall) mode.
From a SmartOS (noinstall) prompt the persistent zpool is wiped clean with:
Reboot will take you back to the GRUB menu, and the default installation script will be activated after timeout. The system will find no old zpool to refer to on the drive and it is ready for a clean installation.