A client called me in because their production servers kept crashing. Every few days, seemingly at random, their EC2 instances would just die. When I asked to see their logs to understand what was happening, they had to SSH into individual servers and grep through files. That’s when I knew we had a bigger problem than just crashes. Their servers were running out of disk space. Not from user data or database growth, but from their own application logs. Every time their application did anything, it wrote to local disk.