Date: Wed, 14 Mar 2001 15:10:04 +0200 From: Vallo Kallaste <vallo@matti.ee> To: Mark Ibell <marki@paradise.net.nz> Cc: stable@FreeBSD.ORG Subject: Re: Disk I/O problem in 4.3-BETA Message-ID: <20010314151004.A391@myhakas.matti.ee> In-Reply-To: <3AAF4DA0.C8DA9485@paradise.net.nz>; from marki@paradise.net.nz on Wed, Mar 14, 2001 at 11:53:20PM %2B1300 References: <200103131007.f2DA73h54023@mobile.wemm.org> <01f001c0abaa$133e1680$4500a8c0@nomad> <20010313032635.Q29888@fw.wintelcom.net> <3AAF4DA0.C8DA9485@paradise.net.nz>
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On Wed, Mar 14, 2001 at 11:53:20PM +1300, Mark Ibell <marki@paradise.net.nz> wrote: > What doesn't appear to have been mentioned is how exactly do we turn off > write caching on SCSI drives. From poking around the best I could work > out was to run 'camcontrol modepage da0 -m 0x08 -e -P 3' and set WCE to > 0 where 0x08 comes from /usr/share/misc/scsi_modes. > > Is this the correct way to do it? > Also, is it okay to leave tagged queuing enabled? (I'm really starting > to get paranoid after all this discussion!) Don't forget the SCSI controller, at least Adaptec has WCE bit enable/disable toggleable flag in the BIOS. When somebody had it set, your change will be clobbered on the next reboot. -- Vallo Kallaste vallo@matti.ee To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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