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mod_storage_multi/README.markdown @ 1886:e502c05c0608

mod_storage_multi: Add README
author Kim Alvefur <zash@zash.se>
date Thu, 01 Oct 2015 17:27:23 +0200
child 1887:a7fdab9c14e2
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1 ---
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2 summary: Multi-backend storage module (WIP)
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3 labels:
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4 - NeedDocs
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5 ...
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6
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7 Introduction
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8 ============
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9
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10 This module attemtps to provide a storage driver that is really multiple
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11 storage drivers. This could be used for storage error tolerance or
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12 caching of data in a faster storage driver.
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13
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14 Configuration
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15 =============
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16
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17 An example:
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18
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19 ``` {.lua}
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20 storage = "multi"
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21 storage_multi_policy = "all"
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22 storage_multi = {
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23 "memory",
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24 "internal",
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25 "sql"
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26 }
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27 ```
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28
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29 Here data would be first read from or written to [mod\_storage\_memory],
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30 then internal storage, then SQL storage. For reads, the first successful
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31 read will be used. For writes, it depends on the `storage_multi_policy`
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32 option. If set to `"all"`, then all storage backends must report success
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33 for the write to be considered successful. Other options are `"one"` and
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34 `"majority"`.