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[disable-scrub] document disable_scrub config option

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Alex Auvolat 2024-03-14 16:57:44 +01:00
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doc/book/operations/durability-repairs.md
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@ -19,7 +19,7 @@ connecting to. To run on all nodes, add the `-a` flag as follows:
# Data block operations # Data block operations
## Data store scrub ## Data store scrub {#scrub}
Scrubbing the data store means examining each individual data block to check that Scrubbing the data store means examining each individual data block to check that
their content is correct, by verifying their hash. Any block found to be corrupted their content is correct, by verifying their hash. Any block found to be corrupted

18
doc/book/reference-manual/configuration.md
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@ -14,6 +14,7 @@ metadata_dir = "/var/lib/garage/meta"
data_dir = "/var/lib/garage/data" data_dir = "/var/lib/garage/data"
metadata_fsync = true metadata_fsync = true
data_fsync = false data_fsync = false
disable_scrub = false
db_engine = "lmdb" db_engine = "lmdb"
@ -87,6 +88,7 @@ Top-level configuration options:
[`data_dir`](#data_dir), [`data_dir`](#data_dir),
[`data_fsync`](#data_fsync), [`data_fsync`](#data_fsync),
[`db_engine`](#db_engine), [`db_engine`](#db_engine),
[`disable_scrub`](#disable_scrub),
[`lmdb_map_size`](#lmdb_map_size), [`lmdb_map_size`](#lmdb_map_size),
[`metadata_dir`](#metadata_dir), [`metadata_dir`](#metadata_dir),
[`metadata_fsync`](#metadata_fsync), [`metadata_fsync`](#metadata_fsync),
@ -344,6 +346,22 @@ at the cost of a moderate drop in write performance.
Similarly to `metatada_fsync`, this is likely not necessary Similarly to `metatada_fsync`, this is likely not necessary
if geographical replication is used. if geographical replication is used.
#### `disable_scrub` {#disable_scrub}
By default, Garage runs a scrub of the data directory approximately once per
month, with a random delay to avoid all nodes running at the same time. When
it scrubs the data directory, Garage will read all of the data files stored on
disk to check their integrity, and will rebuild any data files that it finds
corrupted, using the remaining valid copies stored on other nodes.
See [this page](@/documentation/operations/durability-repair.md#scrub) for details.
Set the `disable_scrub` configuration value to `true` if you don't need Garage
to scrub the data directory, for instance if you are already scrubbing at the
filesystem level. Note that in this case, if you find a corrupted data file,
you should delete it from the data directory and then call `garage repair
blocks` on the node to ensure that it re-obtains a copy from another node on
the network.
#### `block_size` {#block_size} #### `block_size` {#block_size}
Garage splits stored objects in consecutive chunks of size `block_size` Garage splits stored objects in consecutive chunks of size `block_size`