From owner-freebsd-scsi Fri Oct 16 09:33:24 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA20667 for freebsd-scsi-outgoing; Fri, 16 Oct 1998 09:33:24 -0700 (PDT) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from mushi.colo.neosoft.com (mushi.colo.neosoft.com [206.109.6.82]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id JAA20652 for ; Fri, 16 Oct 1998 09:33:21 -0700 (PDT) (envelope-from peter@taronga.com) Received: (qmail 19095 invoked from network); 16 Oct 1998 16:33:01 -0000 Received: from bonkers.neosoft.com (HELO bonkers.taronga.com) (root@206.109.2.48) by mushi.colo.neosoft.com with SMTP; 16 Oct 1998 16:33:01 -0000 Received: (from peter@localhost) by bonkers.taronga.com (8.6.11/8.6.9) id LAA10179; Fri, 16 Oct 1998 11:32:57 -0500 Date: Fri, 16 Oct 1998 11:32:57 -0500 From: peter@taronga.com (Peter da Silva) Message-Id: <199810161632.LAA10179@bonkers.taronga.com> To: scsi@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching In-Reply-To: <199810141501.JAA04936@mt.sri.com> References: <199810140049.RAA20004@usr08.primenet.com><199810140518.XAA15040@pluto.plutotech.com>,<199810140518.XAA15040@pluto.plutotech.com> Organization: none Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org In article <199810141501.JAA04936@mt.sri.com>, Nate Williams wrote: >IMO, CAM should disable write caching by default, and allow people to >add it back by hand if they know how. I don't know how this would be >done, but it's *ALWAYS* a better idea to be safe than to be sorry. This seems like a no-brainer to me. Does write-caching actually improve performance measurably? I would have assumed that FreeBSD would do a better job than any drive could, and it certainly has more resources available. Write-caching always seemed to be one of those Windows-oriented optimizations that were better avoided with real operating systems... unless the write-cache is something like the 128MB battery-backed cache in our Storageworks RAID box down the hall from me. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message