Arne Wörner arne_woerner at yahoo.com
Mon Nov 1 03:33:13 PST 2004

I observed some inconsistencies after I set hw.ata.wc to zero (0):

1. atacontrol does not confirm that write caching is disabled.

2. The write speed on a freshly boot system increases by a factor of 5-6 after
a long read.

I would like to know, if somebody here has experiences with turning off the
write cache of ata devices (how to turn off / how much is performance effected
by the hard disc write cache).

Thank you.

I already posted this to freebsd-fs at freebsd.org but they did not know so much
about this matter.


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