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Diffstat (limited to 'doc/book/src/reference_manual')
| -rw-r--r-- | doc/book/src/reference_manual/configuration.md | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/doc/book/src/reference_manual/configuration.md b/doc/book/src/reference_manual/configuration.md index 0b1e7bc7..9f88b232 100644 --- a/doc/book/src/reference_manual/configuration.md +++ b/doc/book/src/reference_manual/configuration.md @@ -10,6 +10,8 @@ block_size = 1048576 replication_mode = "3" +compression_level = 1 + rpc_secret = "4425f5c26c5e11581d3223904324dcb5b5d5dfb14e5e7f35e38c595424f5f1e6" rpc_bind_addr = "[::]:3901" rpc_public_addr = "[fc00:1::1]:3901" @@ -98,6 +100,30 @@ Never run a Garage cluster where that is not the case.** Changing the `replication_mode` of a cluster might work (make sure to shut down all nodes and changing it everywhere at the time), but is not officially supported. +### `compression_level` + +Zstd compression level to use for storing blocks. + +Values between `1` (faster compression) and `19` (smaller file) are standard compression +levels for zstd. From `20` to `22`, compression levels are referred as "ultra" and must be +used with extra care as it will use lot of memory. A value of `0` will let zstd choose a +default value (currently `3`). Finally, zstd has also compression designed to be faster +than default compression levels, they range from `-1` (smaller file) to `-99` (faster +compression). + +If you do not specify a `compression_level` entry, garage will set it to `1` for you. With +this parameters, zstd consumes low amount of cpu and should work faster than line speed in +most situations, while saving some space and intra-cluster +bandwidth. + +If you want to totally deactivate zstd in garage, you can pass the special value `'none'`. No +zstd related code will be called, your chunks will be stored on disk without any processing. + +Compression is done synchronously, setting a value too high will add latency to write queries. + +This value can be different between nodes, compression is done by the node which receive the +API call. + #### `rpc_secret` Garage uses a secret key that is shared between all nodes of the cluster |