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Diffstat (limited to 'doc/book/reference-manual/configuration.md')
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diff --git a/doc/book/reference-manual/configuration.md b/doc/book/reference-manual/configuration.md index 8e87b7d8..de800ec0 100644 --- a/doc/book/reference-manual/configuration.md +++ b/doc/book/reference-manual/configuration.md @@ -15,6 +15,7 @@ data_dir = "/var/lib/garage/data" metadata_fsync = true data_fsync = false disable_scrub = false +metadata_auto_snapshot_interval = "6h" db_engine = "lmdb" @@ -90,6 +91,7 @@ Top-level configuration options: [`db_engine`](#db_engine), [`disable_scrub`](#disable_scrub), [`lmdb_map_size`](#lmdb_map_size), +[`metadata_auto_snapshot_interval`](#metadata_auto_snapshot_interval), [`metadata_dir`](#metadata_dir), [`metadata_fsync`](#metadata_fsync), [`replication_mode`](#replication_mode), @@ -346,6 +348,25 @@ at the cost of a moderate drop in write performance. Similarly to `metatada_fsync`, this is likely not necessary if geographical replication is used. +#### `metadata_auto_snapshot_interval` (since Garage v0.9.4) {#metadata_auto_snapshot_interval} + +If this value is set, Garage will automatically take a snapshot of the metadata +DB file at a regular interval and save it in the metadata directory. +This can allow to recover from situations where the metadata DB file is corrupted, +for instance after an unclean shutdown. +See [this page](@/documentation/operations/recovering.md#corrupted_meta) for details. + +Garage keeps only the two most recent snapshots of the metadata DB and deletes +older ones automatically. + +Note that taking a metadata snapshot is a relatively intensive operation as the +entire data file is copied. A snapshot being taken might have performance +impacts on the Garage node while it is running. If the cluster is under heavy +write load when a snapshot operation is running, this might also cause the +database file to grow in size significantly as pages cannot be recycled easily. +For this reason, it might be better to use filesystem-level snapshots instead +if possible. + #### `disable_scrub` {#disable_scrub} By default, Garage runs a scrub of the data directory approximately once per |