From owner-freebsd-stable Mon Mar 12 15:17:59 2001 Delivered-To: freebsd-stable@freebsd.org Received: from cage.simianscience.com (cage.simianscience.com [64.7.134.1]) by hub.freebsd.org (Postfix) with ESMTP id DCBAE37B718 for ; Mon, 12 Mar 2001 15:17:53 -0800 (PST) (envelope-from mike@sentex.net) Received: from chimp (fcage [192.168.0.2]) by cage.simianscience.com (8.11.2/8.11.2) with ESMTP id f2CNFeg55916; Mon, 12 Mar 2001 18:15:41 -0500 (EST) (envelope-from mike@sentex.net) Message-Id: <4.2.2.20010312181414.02c135a8@marble.sentex.net> X-Sender: mdtancsa@marble.sentex.net X-Mailer: QUALCOMM Windows Eudora Pro Version 4.2.2 Date: Mon, 12 Mar 2001 18:15:39 -0500 To: Matt Dillon From: Mike Tancsa Subject: Re: Disk I/O problem in 4.3-BETA Cc: Soren Schmidt , stable@FreeBSD.ORG In-Reply-To: <200103122310.f2CNANH77246@earth.backplane.com> References: <200103122036.VAA99695@freebsd.dk> <200103122146.f2CLkLs08952@ptavv.es.net> <20010312140636.A18351@fw.wintelcom.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Is there an equivalent low level IDE util of "sync" that can force the drive to write out it's cache ? ---Mike At 03:10 PM 3/12/2001 -0800, Matt Dillon wrote: > It's actually worse. Someone, I forget who, ran some tests with > write-caching turned on and found that the IDE drive could hold a > pending write in its cache 'forever', even in the face of other writes, > as long as there was other disk activity going on. So we aren't just > talking about issuing I/O's out of order, we are talking about issuing > a sequence of writes and having some of them simply not ever commiting > to disk (not for a long, long time) in a heavily loaded environment. > That's bad news. > > -Matt > > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-stable" in the body of the message -------------------------------------------------------------------- Mike Tancsa, tel +1 519 651 3400 Network Administration, mike@sentex.net Sentex Communications www.sentex.net Cambridge, Ontario Canada www.sentex.net/mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message