Médéric Boquien added the comment:

If I remember correctly the problem is that some OS like linux (and probably 
others) do not really allocate space until something is written. If that's the 
case then the process may get killed later on when it writes something in the 
array.

Here is a quick example:

$ truncate -s 1T test.file
$ ls -lh test.file 
-rw-r--r-- 1 mederic users 1.0T Apr  2 23:10 test.file
$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb1       110G   46G   59G  44% /home

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21116>
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