Ernestas Poškus

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Availability in Globally Distributed Storage Systems

WC 246 / RT 2min


Highly available cloud storage is often implemented with complex, multi-tiered distributed systems built on top of clusters of commodity servers and disk drives. Sophisticated management, load balancing and recovery techniques are needed to achieve high performance and availability amidst an abundance of failure sources that include software, hardware, network connectivity, and power issues.

Component availability

Data availability

Notes

MTTF (mean time to failure) = uptime / number failures

ARR - annual replacement rate

AFR - annual failure rate