Back when I worked at a supercomputing center, we had "operators" on duty, who were supposed to visit the machine room every 2-3h or so and check several things.
It turned out that they were the major cause of hangs and reboots of our SunSITE server (a large FTP archive) — walking on the lifted datacenter floor caused vibrations which were enough to disturb the (terrible) external SCSI connectors to multiple drive arrays.
Back when I worked at a supercomputing center, we had "operators" on duty, who were supposed to visit the machine room every 2-3h or so and check several things.
It turned out that they were the major cause of hangs and reboots of our SunSITE server (a large FTP archive) — walking on the lifted datacenter floor caused vibrations which were enough to disturb the (terrible) external SCSI connectors to multiple drive arrays.
So, I can certainly believe that statement.