Have been involved in a few projects now, where perception and definition of system stability is required. Tried a search to find any simple guide for defining system stability and couldn’t find anything, So I have decided to offer this as a guideline:-
BMC’s System Stability Scale
Level 5 = Bulletproof = 3-months without a Severity-1 or Severity- 2 incident.
Level 4 = Stable = 1-Month without a Severity-1 incident, 1-week without a Severity-2 incident.
Level 3 = Usable = 1-week without a Severity-1 incident, <5 x Severity-2 incidents in past week .
Level 2 = Unstable = 2 x Severity-1 or 5+ x Severity-2 incidents in past week.
Level 1 = Catastrophic = System unavailable for more than 24hrs.
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