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File system cache / drop cache(debian)

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linux-howto

http://serverfault.com – if i play those command : sync echo 3 > /proc/sys/vm/drop_caches Will the server be force to read the correct file on disk until i put 0 again ? Or this work only one time, and if i want to clear cache again, i've to put 0 and 3 again ? Thanks (HowTos)