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You can monitor your filesystem use by executing the df(1M) command regularly during the day. The df command prints out the number of free filesystem blocks and inodes.
It can also be useful to execute the du(1M) command during off-hours. The du command summarizes filesystem usage with a total for each directory. Note that if there are links between files in different directories, where the directories are on separate branches of the filesystem hierarchy, du counts the excess files more than once.
The output from these commands can be kept for later comparison. In this way, you can spot directories that rapidly increase their space usage. However, these reports might not provide the amount of detail you need to pinpoint exact performance problems. ``System performance analysis tools'' describes monitoring tools that provide more detail.