Im a new user of SOLARIS and im facing a question..
Can I mount the same mount point to two diferents file systems..

Ex. /usr mounted on /hd01 and /hd02

2- I have a /hd1 with /usr1 mounted (10Gb)
and /hd2 with /usr2 mounted (5Gb) , I want to swap the /usr1 (mount it on /hd1) and /usr2 (mount it on /hd2). Can I unmount then both and then mount as I want to, without any data loss?