Date: Wed, 24 Feb 1999 10:16:31 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Ruslan Ermilov <ru@ucb.crimea.ua> Cc: "Kenneth D. Merry" <ken@plutotech.com>, allenc@verinet.com, hardware@freebsd.org Subject: Re: Tagged queueing and write cache on WDE SCSI drives Message-ID: <14036.2148.617961.183536@grasshopper.cs.duke.edu> In-Reply-To: <19990224150930.A6284@ucb.crimea.ua> References: <19990223182845.A32766@ucb.crimea.ua> <199902240617.XAA37750@panzer.plutotech.com> <19990224150930.A6284@ucb.crimea.ua>
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Ruslan Ermilov writes: > The best performance is achieved with WC=ON and TQ=OFF. > > Comments? More tests? > > Is this WD-specific? We have a large number of WD drives which came in donated Intel PII's For all these drives, TQ off, WC on gives the best results. For other vendor's drives (various models of modern Seagate barricuda & cheetah drives), TQ on, WC on gives the best results. Given any choice in the matter, I'd never willingly purchase a WD scsi drive. Even most modern UDMA IDE drives perform far better. ------------------------------------------------------------------------------ Andrew Gallatin, Sr Systems Programmer http://www.cs.duke.edu/~gallatin Duke University Email: gallatin@cs.duke.edu Department of Computer Science Phone: (919) 660-6590 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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