+
−---
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−summary: Multi-backend storage module (WIP)
+
−labels:
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−- NeedDocs
+
−- Stage-Alpha
+
−...
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−
+
−Introduction
+
−============
+
−
+
−This module attemtps to provide a storage driver that is really multiple
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−storage drivers. This could be used for storage error tolerance or
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−caching of data in a faster storage driver.
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−
+
−Configuration
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−=============
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−
+
−An example:
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−
+
−``` {.lua}
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−storage = "multi"
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−storage_multi_policy = "all"
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−storage_multi = {
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−    "memory",
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−    "internal",
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−    "sql"
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−}
+
−```
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−
+
−Here data would be first read from or written to [mod\_storage\_memory],
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−then internal storage, then SQL storage. For reads, the first successful
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−read will be used. For writes, it depends on the `storage_multi_policy`
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−option. If set to `"all"`, then all storage backends must report success
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−for the write to be considered successful. Other options are `"one"` and
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−`"majority"`.