Add description about possible fragmentation with --file-allocation=trunc

pull/615/head
Tatsuhiro Tsujikawa 2016-04-03 18:32:23 +09:00
parent 395b8e93c5
commit 458d42c1e1
1 changed files with 6 additions and 0 deletions

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@ -1320,6 +1320,12 @@ Advanced Options
Possible Values: ``none``, ``prealloc``, ``trunc``, ``falloc``
Default: ``prealloc``
.. Warning::
Using ``trunc`` seemingly allocates disk space very quickly, but
what it actually does is that it sets file length metadata in
file system, and does not allocate disk space at all. This means
that it does not help avoiding fragmentation.
.. option:: --force-save[=true|false]