From owner-freebsd-questions Wed Aug 30 16:28: 6 2000 Delivered-To: freebsd-questions@freebsd.org Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by hub.freebsd.org (Postfix) with ESMTP id 4914637B43F for ; Wed, 30 Aug 2000 16:27:56 -0700 (PDT) Received: (from grog@localhost) by wantadilla.lemis.com (8.11.0/8.9.3) id e7UNQl603891; Thu, 31 Aug 2000 08:56:47 +0930 (CST) (envelope-from grog) Date: Thu, 31 Aug 2000 08:56:47 +0930 From: Greg Lehey To: Holtor Cc: freebsd-questions@FreeBSD.ORG Subject: Re: SCSI Write Cache & SoftUpdates Message-ID: <20000831085647.D34978@wantadilla.lemis.com> References: <20000830144954.25294.qmail@web113.yahoomail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <20000830144954.25294.qmail@web113.yahoomail.com>; from holtor@yahoo.com on Wed, Aug 30, 2000 at 07:49:54AM -0700 Organization: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.lemis.com/~grog X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG [Format recovered--see http://www.lemis.com/email/email-format.html] Your mailer mutilates quoted text. On Wednesday, 30 August 2000 at 7:49:54 -0700, Holtor wrote: > --- Greg Lehey wrote: >> On Tuesday, 29 August 2000 at 19:37:03 -0700, Holtor wrote: >>> I am thinking of enabling softupdates but have read in the >>> questions/stable mail listing archives that enabling softupdates >>> when the scsi hard drive has write cache enabled could cause >>> trouble that would not normally be experienced. >>> >>> Does anyone know if there is any truth to that? Is disabling write >>> cache not a good idea? If anyone could offer up some suggestions, >>> that would be beneficial. >> >> In general, you can't rely on disks to complete cached writes if >> the power fails. This doesn't have anything to do with soft >> updates. Soft updates will probably protect you better in this >> situation, but if you value your data you should turn off write >> caching. > > Right now my drive has write cache enabled and softupdates > disabled. So when enabling softupdates I should disable the write > cache. This worried me: "if you value your data you should turn of > write caching" - Does that mean it should be off if softupdates are > enabled or not? Yes. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message