Originally posted by: ostost
vmstat shows the number of free pages. Also take a look at the numperm value (can be displayed with vmstat -v) which shows what percentage of the memory is used for file caching. AIX will use unused memory as file cache. Therefore it's not unusual that most of the memory is in use. But it's important to differentiate how much of that is actually used for running processes and how much for file cache.
#AIX-Forum