Explain when to implement fault tolerance and disaster recovery.
Fault
tolerance is the ability of a system to continue functioning when
part of the system fails. Normally, fault tolerance is used in
describing disk subsystems, but it can also apply to other parts of
the system or the entire system. Fully fault-tolerant systems use
redundant disk controllers and power supplies as well as
fault-tolerant disk subsystems. You can also use an uninterruptible
power supply (UPS) to safeguard against local power failure.
Although the data is always available in a fault-tolerant system,
you still need to make backups that are stored offsite to protect
the data against disasters such as a fire.
