Still, heat issues can impact any electronic
system, so we should remain diligent and account for temperature control in
our disaster recovery discussion.
Internal System Heat
If you??™ve ever had a PC or server simply lock up with no response from the operating system,
you??™ve most likely overheated the system. Internal cooling for a computer??”whether
a PC or a server??”is a critical function.
CPUs generate an incredible amount of heat. They have heat sinks physically
attached to them to keep them at a reasonable temperature. Fans are used to blow hot air
out of the casing in an attempt to maintain temperature. Usually server hardware devices
CHAPTER 10 n HARDWARE CONSIDERATIONS 265
have a number of redundant cooling fans. However, fans are mechanical devices and will
fail. If a computer reaches an internal temperature that is dangerous for the CPU, the
hardware will halt operation by design. Some systems have hardware-based heat sensors
that will shut down a server if it even comes close to overheating.
Ensuring that a server has sufficient cooling is nothing to take for granted.
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