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document minPackSize

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This commit is contained in:
Kyle Brennan
2022-04-30 15:16:00 -07:00
committed by Michael Eischer
parent 1e3f05c3f1
commit e43be84eb8
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doc/047_tuning_backup_parameters.rst
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@@ -8,6 +8,7 @@
- for subsections
^ for subsubsections
" for paragraphs
########################
Tuning Backup Parameters
########################
@@ -48,3 +49,22 @@ which will compress very fast), ``max`` (which will trade backup speed and CPU u
slightly better compression), or ``off`` (which disables compression). Each setting is
only applied for the single run of restic. The option can also be set via the environment
variable ``RESTIC_COMPRESSION``.
Pack Size
=========
In certain instances, such as very large repositories, it is desired to have larger pack
sizes to reduce the number of files in the repository. Notable examples are OpenStack
Swift and some Google Drive Team accounts, where there are hard limits on the total
number of files. This can be achieved by either using the ``--min-packsize`` flag
or defining the ``$RESTIC_MIN_PACKSIZE`` environment variable. Restic currently defaults
to a 16MB minimum pack size.
The side effect of increasing the pack size is increased client memory usage. A bit of
tuning may be required to strike a balance between memory usage and number of pack files.
Restic uses the majority of it's memory according to the pack size, multiplied by the number
of parallel writers. For example, if you have 4 parallel writers (restic creates one per
available CPU), With a minimum pack size of 64 (Megabytes), you'll get a *minimum* of 256MB
of memory usage.