I apologize, I wronged about dd command:

dd if=/dev/rdsk/c9t0d3 of=/dev/null bs=1024k

About /etc/lvmtab: the last vgscan command recreated /etc/lvmtab according to disks that system finds with relative volume groups. Your vgexport took out disks. Then you do a vgimport now.

Anyway /dev/dsk/c9t0d3 seems to not be existent! Because all commands don't recognize it (I am enough sure to tell you that dd command fail too).
A silly question: are you sure that LUN is called /dev/dsk/c9t0d3?