Hi,

sorry for the delayed reply.

Please see those questions and send me please the output for "onstat -d" and "tail -10000 online.log".

In mirroring, we are not going to keep mirroring in OS level. not in informix level.
This instance has only two instances. we shutdown the other instance while we run performance testing.

yes , you are right about checkpoint interval.

I have attached onstat and online log.

Thanks for your time Luis.