Date: Wed, 7 Mar 2001 20:06:13 -0600 From: Mike Meyer <mwm@mired.org> To: "Philip J. Koenig" <pjklist@ekahuna.com> Cc: questions@freebsd.org Subject: Re: SoftUpdates/hardware write cache Message-ID: <15014.59669.718668.654739@guru.mired.org> In-Reply-To: <123006805@toto.iv>
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Philip J. Koenig <pjklist@ekahuna.com> types: > Apparently the new drive has the internal write cache turned off by > default. I'm about to enable SoftUpdates with the tunefs thing and I > was wondering if I should also enable the disk's internal write > cache. My experience in the past with other OS's says it can make a > big performance improvement. Generally, this isn't recommended. Soft updates *depend* on the device actually having written the data to disk when it claims it has, and in the order it specified. > This machine runs on a large UPS so power-loss isn't a big issue. Well, if you want to try it, go ahead. If you have the time, I'd be interested in timings for all four cases (softupdates yes/no, write cache yes/no). > I know there is some Unix program that can at least read mode pages, > I'm hoping it can set them too. My DOS program won't work on this > hardware and I'd hate to have to stick the drive on a Windows machine > to set that setting. :-) Camcontrol can do that for your scsi devices. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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