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Add warning of the performance of prune

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I went pretty loud with this, but I think the performance is bad enough
that it's really worth highlighting, especially since it locks the index
during the prune.
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Mike Lissner 2018-07-31 13:15:27 -07:00 committed by Alexander Neumann
parent 3151978f58
commit 2caf8edc55
1 changed files with 7 additions and 0 deletions
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doc/060_forget.rst
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@ -23,6 +23,13 @@ data that was referenced by the snapshot from the repository. This can
be automated with the ``--prune`` option of the ``forget`` command, be automated with the ``--prune`` option of the ``forget`` command,
which runs ``prune`` automatically if snapshots have been removed. which runs ``prune`` automatically if snapshots have been removed.
.. Warning::
Pruning snapshots can be a very time-consuming process, taking nearly
as long as backups themselves. During a prune operation, the index is
locked and backups cannot be completed. Performance improvements are
planned for this feature.
It is advisable to run ``restic check`` after pruning, to make sure It is advisable to run ``restic check`` after pruning, to make sure
you are alerted, should the internal data structures of the repository you are alerted, should the internal data structures of the repository
be damaged. be damaged.