A simple approach to tackle the problem of growing need of partition is to use the links to share which has excess space. It happens many times in IT environment that the disk which is having the running application runs out of space. But at the same time we have many partitions whose space is underutilized.

Example:
We have one /app partition of 200 GB but it is already 90% full. Application team is demanding 100 GB extra on the same partition. At the same time we have /extra partition of 250 Gb with current space utilization of 50 GB only. So without disturbing the current setup we can allocate the space which is there in /extra to /app by creating a sym link.

process is simple create a sub directory in /extra and do the linking:

# mkdir /extra/app; ln -s /extra/app /app

However if you have a large number of sym links the task of space management will become a bit tough. Normal team will not be aware how this stuff works but still overall space allocation will always depend on these sym links as well. But this is very good temporary change which you can make untill the things are sorted out.