Preventing the nightly backup from disturbing the cache

[andy at warmcat.com (Andy Green)]

Adam Gibson wrote:

> I am rather surprised that this has not been dealt with by now.  Why 
> mess with the currently cached information when you know that the files 
> being read will be many times more than your memory/swap space and will 
> only need to be read once.

It's possible to use the flag

O_DIRECT

http://homepages.cwi.nl/~aeb/linux/man2html/man2/open.2.html

It's up to your backup program if it wants to use the flag or not, but 
it is there.

-Andy
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