Limits RegistryPUBLIC RECORD
Limits RegistryAWS publishes a "designed to provide 99.999999999%" (11 nines) annual durability target for S3 Standard storage, based on redundancy across at least 3 Availability Zones. This is a modeled engineering target stated in AWS's own documentation, not a third-party-audited empirical result — no major cloud provider (AWS, Azure, Google Cloud, Backblaze) publishes an independently audited durability measurement, so this figure should be read as a vendor design claim, not a verified outcome.
The question, scope, and sources behind this Registry record.
AWS publishes a "designed to provide 99.999999999%" (11 nines) annual durability target for S3 Standard storage, based on redundancy across at least 3 Availability Zones. This is a modeled engineering target stated in AWS's own documentation, not a third-party-audited empirical result — no major cloud provider (AWS, Azure, Google Cloud, Backblaze) publishes an independently audited durability measurement, so this figure should be read as a vendor design claim, not a verified outcome.
The highest annual durability figure published by a major commercial cloud object-storage provider for a standard storage tier — explicitly a vendor-engineered design target, not an independently audited measured outcome (no major provider publishes an independently audited durability measurement).
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
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Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
Permanent ID limitsregistry.com/limits/LR-CLOUD-STORAGE-DURABILITY
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Limits Registry. LR-CLOUD-STORAGE-DURABILITY. Cloud object storage durability (vendor-published target). 2026.