Entropy

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is the capacity of a system of generating random numbers. The Entropy increases during Input/Output operations.

  • for example from /dev/urandom
  • to check the available amount of entropy:

cat /proc/sys/kernel/random/entropy_avail

  • this shows a server that run out of entropy due to a I/O driver failure, this caused no I/O to any device and consequently no entropy

Entropy.png