C1 (3 points)

https://knobit.org/id/task/dso-backup-recovery/C1

dcterms:license	https://creativecommons.org/licenses/by/4.0/
owl:sameAs	https://bitbucket.org/reffa/ontology/id/task/dso-backup-recovery/C1
rdfs:label	C1 (3 points) en
schema:hasPart	dso-backup-recovery C1: numbers that cannot all be true
schema:identifier	C1
schema:position	1
schema:text	Numbers that cannot all be true, 1 each. (a) DS-001, the payments hub database, promises an RPO of 5 minutes while its log shipping runs hourly and its replica lags an hour: the copies cannot deliver it. Found by comparing the RPO with the copy intervals. (b) Card authorisation (CS-002) tolerates 30 minutes, but its data sets have RTOs of 45 minutes (DS-003, card management) and 1 hour (DS-002, core banking): both exceed the tolerance of a service that needs them. Found by holding each RTO against every dependent service's tolerance. (c) The fixes keep the business's numbers: copies made frequent enough for the RPO (or the RPO raised as a question to the service owner), recovery made fast enough for the tolerance (or the gap raised) - never a tolerance loosened to make the plan pass. en

Used by

has question	Retail bank recovery plan against DORA impact tolerances (backup, recovery and continuity anomaly skills)
schema:isPartOf	dso-backup-recovery C1: numbers that cannot all be true