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Availability & SLA

Model availability from MTBF/MTTR or per-component percentage and its redundancy (series, parallel or N+1). Get the nines and the downtime per year, month and week.

Topology

Series: all must work; availability drops. A = ∏ Aᵢ

Per-component input

A = MTBF / (MTBF + MTTR), in the same time units (hours).

Components
redzilla.cl — sla
 
Availability
Downtime / year
out-of-service time
Downtime / month
monthly average
Downtime / week
weekly average
A (%)
Nines
Year
Per-component contribution
Component A (%) Nines Downtime / year

The nines of availability
SLA Nines Downtime / year Downtime / month Downtime / week

Periods: year = 525,600 min (365 d), month = 43,800 min (year/12), week = 10,080 min (7 d). MTBF/MTTR must be in the same time units. The model assumes independent, uncorrelated failures.

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