C2 (2 points)
https://knobit.org/id/task/dso-recovery-service-levels/C2
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| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
|---|---|
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/task/dso-recovery-service-levels/C2 |
| rdfs:label | C2 (2 points) en |
| schema:hasPart | dso-recovery-service-levels C2a: SL-101 composed as the product, not the weakest link, and the target kept |
| schema:hasPart | dso-recovery-service-levels C2b: SL-103's chain composed |
| schema:hasPart | dso-recovery-service-levels C2c: the independence the product assumes |
| schema:identifier | C2 |
| schema:position | 2 |
| schema:text | Composition, (a) 1, (b) and (c) 0.5 each. (a) SL-101's draft composed figure 0.9995 is the weakest component, not the chain: components in series compose to the product of their availabilities, 0.9995 x 0.9995 x 0.9995 = 0.9985 (99.85 %). The composed figure is corrected and the 0.998 target left standing, because the chain supports it; lowering the target, or reporting it as unsupportable, loses this point. (b) SL-103's chain composed: 0.9995 x 0.9995 x 0.999 = 0.9980 (99.80 %). (c) The answer states that the product assumes the components fail independently (shared infrastructure or common-mode failures break that assumption). en |