On Sun, 28 Aug 2011, Polytropon wrote:
Is there a way to force "synchronous disk activity"?
Turning off soft updates will help, but not make disk writes
totally synchronous.
Can this be done easily (e. g. "tunefs -n disable <devices" in
SUM to the unmounted partitions), without data loss? I have to
admit that I've never tried that before.
SUM isn't needed, just have the filesystem unmounted. Never had data
loss from it.
Disabling write caching will also help to make filesystem writes more
synchronous. There are several sysctls and some information on soft
updates at http://www.freebsd.org/doc/handbook/configtuning-disk.html.
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