Mirroring

I am currently on 7.11.UC1 on HP-UX 9.04 To experiment (before implementing), I created a mirror of the root_dbs. Both the root and the mirror are seperate logical (and physical) devices. The links to the devices were created in /usr/informix/dev. t_root_dbs and t_root_mir After recovery of the root had taken place (watched the log), I did a level 0 to make sure everything was in sync. Then I deleted the symbolic link in /usr/informix/dev to t_root_dbs so it would be on the mirror. I then waited for onstat -d or the log to report the root_dbs was down. I then did update stats on a table. Dropped and recreated another table. Created a stored procedure. (All should of had activity on the root_dbs space). onstat -d showed reads and writes from the now (supposedly missing) root_dbs. Again I waited. Two check points; another hour. NO MESSAGES that I now have a (simulated) device error. I called INFORMIX help, and their answer was that I had to bounce the server (at least once a week, according to their guidelines) in order to find a problem. If I have a 24x7 system, & cannot bounce the server, the mirroring is a moot point. Someone please tell me this is wrong. TIA Chris