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Availability, Recovery Time Objective (RTO)
and Recovery Point Objective (RPO)

Business continuance and disaster recovery corporate objectives should be based on the following criteria:

Availability is defined with five classes as:

  • mission critical where the server or data must be available 99.999% of the time - the "five-nines" level of protection equates to 5 minutes downtime per year
  • business vital is 99.99% availability = 53 minutes downtime per year
  • mission important is 99.9% or 9 hours per year
  • data important is 99% or 3.6 days per year
  • data not important is 90% or 36 days per year

Recovery Time Objective (RTO) is defined as the maximum time allowable for recovering data:

  • mission critical data the RTO (taken as .00001 of the total year) is 1.5 minutes
  • business vital data the RTO is 15 minutes
  • mission important data the RTO is two hours
  • data important for productivity the RTO is one day
  • data not important to operation the RTO is one week

Recovery Point Objective (RPO) is how much work in progress that can be lost:

  • Tier 0 - No off-site data
  • Tier 1 - Data backup with no Hot Site
  • Tier 2 - Data backup with a Hot Site
  • Tier 3 - Electronic vaulting
  • Tier 4 - Point-in-time copies
  • Tier 5 - Transaction integrity
  • Tier 6 - Zero or little data loss
  • Tier 7 - Highly automated, business-integrated solution

Criteria
Availability Downtime/year Recovery time
HP NonStop
99.99999%
3 seconds
1 second
Mission Critical
99.999%
5 minutes
1.5 minutes
Business Vital
99.99%
53 minutes
15 minutes
Mission Important
99.9%
9 hours
2 hours
Important
99%
3.6 days
1 day
Not Important
90%
36 days
1 week

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