From owner-cvs-all Fri Jun 22 9:32:33 2001 Delivered-To: cvs-all@freebsd.org Received: from mikea.ath.cx (okc-65-26-223-53.mmcable.com [65.26.223.53]) by hub.freebsd.org (Postfix) with ESMTP id 6F09837B403; Fri, 22 Jun 2001 09:32:26 -0700 (PDT) (envelope-from mikea@mikea.ath.cx) Received: (from mikea@localhost) by mikea.ath.cx (8.11.4/8.11.1) id f5MGW0K73092; Fri, 22 Jun 2001 11:32:00 -0500 (CDT) (envelope-from mikea) Date: Fri, 22 Jun 2001 11:32:00 -0500 From: mikea To: Mikhail Teterin Cc: "Daniel O'Connor" , cvs-all@FreeBSD.ORG, cvs-committers@FreeBSD.ORG, jhb@FreeBSD.ORG Subject: Re: cvs commit: src/sys/vm vm_pageout.c Message-ID: <20010622113200.B72711@mikea.ath.cx> References: <200106221613.f5MGDGA80305@aldan.algebra.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.4i In-Reply-To: <200106221613.f5MGDGA80305@aldan.algebra.com>; from mi@aldan.algebra.com on Fri, Jun 22, 2001 at 12:13:16PM -0400 Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, Jun 22, 2001 at 12:13:16PM -0400, Mikhail Teterin wrote: > =On 22-Jun-2001 Mikhail Teterin wrote: > => BTW, will FreeBSD ever be able to _stop_ paging onto a particular > => devices? IMHO, it is quite embarassing to not have this feature > => after other OSes have had it for years. > > =Why? Ever needed to USE that particular feature? > > Yes, on a number of occasions. Its un-orthogonal. I can turn swapping > on, but I can not turn it off without rebooting. Yackk. See also the > BUGS sections of swapon(8). Also yes, more than a few times. When I ran a mainframe shop (MVS, then OS/390) on IBM iron, we had the ability (after lots of people griped because it wasn't there) to turn off paging and/or swapping on a particular page/swap file so that we could take the device offline for maintenance. The IBM developers asked why we would ever want to do that; apparently they had never heard of hardware failures or of device monitors (e.g., SMART in the PC world, IOS in the MVS mainframe world) that warned of them being impending. In my humble opinion, backed up by 37 years of fighting computers to a draw, this needs to be added to FreeBSD. -- Mike Andrews mikea@mikea.ath.cx Tired old sysadmin since 1964 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message