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However, this also means that during a planned or unplanned outage of a single controller, the array has lost 50% of its total performance profile. If not, a single controller failure could cause a data outage or corruption. This brings two challenges: data consistency and complexity. All controllers must act in harmony as one.
In 2012, Carnegie Mellon’s Software Engineering Institute (SEI) and the U.S. Warning: A single failurecyberattack, outage, or human errorcould result in total data loss and extended downtime. Computer Emergency Readiness Team (US-CERT) recommended the 3-2-1 rule as a best practice for ensuring data resilience.
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