Date: Thu, 4 Oct 2001 15:47:45 -0500 From: Mike Meyer <mwm@mired.org> To: Zhihui Zhang <zzhang@cs.binghamton.edu> Cc: Magdalinin Kirill <bsdforumen@hotmail.com>, questions@FreeBSD.ORG Subject: Re: turning off write cache on SCSI drive Message-ID: <15292.51953.728016.474117@guru.mired.org> In-Reply-To: <Pine.SOL.4.21.0110041556180.11068-100000@onyx> References: <15292.48443.672916.539479@guru.mired.org> <Pine.SOL.4.21.0110041556180.11068-100000@onyx>
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Zhihui Zhang <zzhang@cs.binghamton.edu> types: > On Thu, 4 Oct 2001, Mike Meyer wrote: > > > Magdalinin Kirill <bsdforumen@hotmail.com> types: > > > Hello, > > > some mail posts on softupdates says that turning off write cache is > > > prerequisite for it. > > They're generally talking about IDE drives. SCSI drives have tagged > > queuing, which means you're perfectly safe doing this. > Why tagged queuing make it safe to turn WCE on? The problem that WCE presents is that a write to the drive returns, but the data isn't really on the drive. Tagged queuing allows the drive to tell the software when the data is really on the drive. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Q: How do you make the gods laugh? A: Tell them your plans. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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