[rrd-developers] bus error when disk is full, with mmap & sparse file

Tobias Oetiker tobi at oetiker.ch
Thu Feb 2 08:37:47 CET 2012

Today Richard Laager wrote:

> On Thu, 2012-02-02 at 07:22 +0100, Tobias Oetiker wrote:
> > * with the patch, we get performance and a sort of thin provisioning (files
> >   with holes).
> fallocate() does not create holes. From fallocate(2), "After a
> successful call, subsequent writes into this range are guaranteed not to
> fail because of lack of disk space."
> fallocate() is Linux-specific. The portable equivalent is
> posix_fallocate(). On Linux, that does much the same thing as with this
> patch; it tries fallocate() first and then falls back to zero-filling.
> I'm not sure if that zero filling code performs better or worse than
> your mmap() code.

oops my bad :-) ok ... posix_fallocate then ...


Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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