Disable cache disk

Hello,

I write a lot of files on a USB disk for video monitoring archiving.
The write program is faster than the USB.

Cache disk take all RAM and kernel start swapping and everything become very slow. 1/ is-it possible to *really* be synchronize. I prefer to have a blocked write() than use cache and get swap!

2/ is-it possible to disable cache disk ?

Thanks,

Yves

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url:http://crespin.quartz.free.fr/
version:2.1
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