I'm trying to turn off the evil data corrupting on-disk write cache.
I added hw.ata.wc=0 to /boot/loader.conf and rebooted.
# sysctl hw.ata.wc
hw.ata.wc: 0
So far so good. But! atacontrol cap ad4 says:
Feature Support Enable Value Vendor
write cache yes yes
So hw.ata.wc thinks that the disk write cache is off,
but atacontrol cap thinks the disk write cache is on?
If it matters: AMD64, nforce4, Seagate SATA 7200.8, FreeBSD 6.0 Beta3
So then I boot NetBSD and turn the write caches off with
dkctl $disk setcache r
and reboot FreeBSD and now I get
Feature Support Enable Value Vendor
write cache yes no
It appears that if hw.ata.wc = 1 then FreeBSD turns the write
cache on, and if hw.ata.wc = 0 then FreeBSD leaves the write
cache alone?
Is there a way to have FreeBSD turn the write cache OFF?
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