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Merge pull request #3874 from MichaelEischer/disk-wear-note

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Add note that larger packs increase disk wear
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MichaelEischer 2022-08-21 22:18:08 +02:00 committed by GitHub
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doc/047_tuning_backup_parameters.rst
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@ -28,7 +28,7 @@ the REST backend the parameter would be ``-o rest.connections=5``. By default re
``5`` connections for each backend, except for the local backend which uses a limit of ``2``. ``5`` connections for each backend, except for the local backend which uses a limit of ``2``.
The defaults should work well in most cases. For high-latency backends it can be beneficial The defaults should work well in most cases. For high-latency backends it can be beneficial
to increase the number of connections. Please be aware that this increases the resource to increase the number of connections. Please be aware that this increases the resource
consumption of restic and that a too high connection count *will degrade performace*. consumption of restic and that a too high connection count *will degrade performance*.
CPU Usage CPU Usage
@ -72,3 +72,9 @@ of backend connections plus one. For example, if the backend uses 5 connections
for most backends), with a target pack size of 64 MiB, you'll need a *minimum* of 384 MiB for most backends), with a target pack size of 64 MiB, you'll need a *minimum* of 384 MiB
of space in the temp directory. A bit of tuning may be required to strike a balance between of space in the temp directory. A bit of tuning may be required to strike a balance between
resource usage at the backup client and the number of pack files in the repository. resource usage at the backup client and the number of pack files in the repository.
Note that larger pack files increase the chance that the temporary pack files are written
to disk. An operating system usually caches file write operations in memory and writes
them to disk after a short delay. As larger pack files take longer to upload, this
increases the chance of these files being written to disk. This can increase disk wear
for SSDs.