Add basic Garage doc
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doc/garage.md
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# Garage
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Our S3-compatible object storage service is based on [Garage][1].
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Garage is running as a cluster, with one VM each on 3 different physical hosts
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in 2 different zones (data centers).
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Replication mode is set to "2", meaning PUTs are always immediately synced to
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nodes in 2 different zones (write/read consistency guaranteed by default).
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When all nodes in one zone become unavailable, the cluster is switching to
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read-only mode automatically, since the write quorum cannot be reached in that
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case. If it is necessary (in an emergency) to write to nodes in only one zone,
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you can change the replication mode to "2-dangerous", which lowers the write
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quorum to 1.
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Please refer to the [replication documentation][2] for more detailed information.
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[1]: https://garagehq.deuxfleurs.fr
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[2]: https://garagehq.deuxfleurs.fr/documentation/reference-manual/configuration/#replication-mode
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