Availability and Downtime

Availability

Availability is the uptime share of one deterministic cycle.

highlighted = computed this step

Availability

Availability is uptime divided by the full cycle.

availability=MTBFcycle\text{availability} = \frac{\text{MTBF}}{\text{cycle}}
Availability ratiosThe table shows uptime and downtime shares of the cycle.availability and downtime fractionscyclefractionavailability504/5downtime501/5

Availability Value

Availability is 4/5.

40/50=4/540 / 50 = 4/5
Maintenance availabilityThe chart shows uptime and downtime shares in the deterministic cycle.maintenance availabilitycycle 50; availability 4/5; downtime 1/5caseMTBFMTTRcycleavailabilitydowntimebase4010504/51/5what-if405458/91/9baseup 40down 10cycle 50what-ifup 40down 5cycle 45what-if MTTR 5; availability gain 4/45deterministic two-number availability arithmetic only