Red Hat Enterprise Linux7 offers a few more tools with which to perform system auditing and analysis. Most of them can be used as supplementary sources of information in case you want to verify what you have discovered already or in case you need more in-depth information on certain parts. Many of these tools are used for performance tuning as well. They include:
vmstat gives you detailed information about processes, memory, paging, block I/O, traps, and CPU activity. Use it to take a closer look at what the system overall does and where it is busy.
iostat is similar to vmstat, but only for I/O on block devices. It also provides more verbose output and statistics.
blktrace is a very detailed block I/O trace program. It breaks down information to single blocks associated with applications. It is very useful in combination with diskdevstat.