How can hardware be designed for fault tolerance? Are these methods applicable to software? Why or why not?
What will be an ideal response?
The
primary
hardware
control
is
redundancy,
sometimes
massively
so.
Note
that
hardware
is
expected
to
wear
out,
and
mean
time
between
failure
is
an
important
measure
of
the
degree
of
hardware
redundancy
that
is
required
to
meet
criticality
requirements.
Software,
on
the
other
hand,
does
not
"wear
out":
software
that
is
20
years
old
will
function
just
as
well
as
new
software
in
an
appropriate
setting.
Software
failure
rate
is
much
harder
to
estimate
correctly.
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