need help with my links to raw device

Hi, I have an Informix 7.31 database on an ultra 2 running solaris 2.6. My question is all my chunks in my database are linked to /dev/dsk/c?t? d?s?. I've been told that I need to change this to /dev/rdsk/c?t?d?s? in order to achieve async I/O and get faster io rates. I'm running top and it saying that my iowait is up in the 80% range. Can I just offline my database and redo my links without loosing data? Or do I need to redo my entire database? Does it make a difference whether or not I'm mounting ../dsk/.. or ../rdsk/..? Thanks in advance... Sent via Deja.com http://www.deja.com/ Before you buy.