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TAPE ROTATION EXAMPLES
 
GENERAL TAPE TRACKING
 
FIVE TAPE ROTATION
One Per Day
 
GRANDFATHER - FATHER - SON (GFS)
Daily - "Son Tapes"
Weekly - "Father Tapes"
Monthly - "Grandfather Tapes"
 
TOWER OF HANOI
A - Used Every Other Day
B - Used Every 4th Day
C - Used Every 8th Day
D & E - Used Every 16th Day, Alternating
 
TOWER OF HANOI

The Tower of Hanoi a complex strategy where five tapes are used - called A, B, C, D, and E.

  • A - Used Every Other Day
  • B - Used Every 4th Day
  • C - Used Every 8th Day
  • D & E - Used Every 16th Day, Alternating

This ensures that data is available from the last day, 2 days ago, and three other times in history. However, the range of history of backup is dependent on where one is in the cycle.

Consider the following calendar:


This method is clearly confusing, but has the advantage of only requiring 5 tapes. Unless aided by software, this method is not recommended because it is prone to human error.


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