Compaq Tru64 5.1 & Oracle 7.3.4.5

We have some problems about asynchronous write and write back cache. Some serious problems occur more frequently nowadays. The system suddenly slow down and we can’t find the reason of the problem.We have data loss because of system hangs up.

Is there any information about Compaq Tru64 5.1 & Oracle 7.3.4.5 works together efficiently?