mod_storage_multi

Introduction

This module attemtps to provide a storage driver that is really multiple storage drivers. This could be used for storage error tolerance or caching of data in a faster storage driver.

Configuration

An example:

storage = "multi"
storage_multi_policy = "all"
storage_multi = {
    "memory",
    "internal",
    "sql"
}

Here data would be first read from or written to mod_storage_memory, then internal storage, then SQL storage. For reads, the first successful read will be used. For writes, it depends on the storage_multi_policy option. If set to "all", then all storage backends must report success for the write to be considered successful. Other options are "one" and "majority".

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