ur's disk space is only 3 gb. and u have used that space for some partition. then how can u get extra space from that. so make the disk something high ( 10g). dont give the auto partition. give the customize partition, while installation.

devfsadm --- command used to updated new inserted device.

devfsadm -c <diskname>

devfsadm -v <diskinfo>

touch/reconfigure is also used to for the same thing.