At the prompt asking for a root file system to mount, any device that contains a valid root file system can be entered. If
<filename>/etc/fstab
</filename> is set up correctly, the default should be something like
<literal>ufs:/dev/gvinum/root
</literal>. A typical alternate choice would be something like
<literal>ufs:da0d
</literal> which could be a hypothetical partition containing the pre-
<filename>vinum
</filename> root file system. Care should be taken if one of the alias
<literal>a
</literal> partitions is entered here, that it actually references the subdisks of the
<filename>vinum
</filename> root device, because in a mirrored setup, this would only mount one piece of a mirrored root device. If this file system is to be mounted read-write later on, it is necessary to remove the other plex(es) of the
<filename>vinum
</filename> root volume since these plexes would otherwise carry inconsistent data.