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Debian GNU/Linux Reference Guide
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7.3.2 Disk flush intervals

You can change disk flush intervals through the proc filesystem. The following will shorten its interval from the default five seconds to one second.

     # echo "40 0 0 0 100 30000 60 0 0"  > /proc/sys/vm/bdflush

This may negatively impact file I/O performance a little bit. But this secures file contents except for the last one second which is shorter than the default five seconds. This is true even for journaling filesystems.

Debian GNU/Linux Reference Guide
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