From owner-freebsd-current Tue Jan 19 09:18:01 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA12555 for freebsd-current-outgoing; Tue, 19 Jan 1999 09:18:01 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from jli.com (jli.com [199.2.111.1]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id JAA12541 for ; Tue, 19 Jan 1999 09:17:59 -0800 (PST) (envelope-from trost@cloud.rain.com) Received: (qmail 16970 invoked by uid 4); 19 Jan 1999 17:17:54 -0000 Received: (qmail 47219 invoked from network); 18 Jan 1999 20:54:50 -0000 Received: from localhost.cloud.rain.com (HELO grey.cloud.rain.com) (127.0.0.1) by localhost.cloud.rain.com with SMTP; 18 Jan 1999 20:54:50 -0000 To: current@FreeBSD.ORG Subject: Re: mounting double-ended SCSI disks References: <199901161020.CAA47520@silvia.hip.berkeley.edu> In-reply-to: Your message of Sat, 16 Jan 1999 02:20:06 PST. <199901161020.CAA47520@silvia.hip.berkeley.edu> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <47215.916692888.1@grey.cloud.rain.com> Date: Mon, 18 Jan 1999 12:54:49 -0800 Message-ID: <47216.916692889@grey.cloud.rain.com> From: Bill Trost Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Satoshi Asami writes: However, if I try to mount it from B read-only while A is mounting it read-write, it succeeds. This looks dangerous, as A writing data onto the disk could cause B's cache to go stale without B knowing it. Just about as dangerous al letting A mount it read-only, and then B mounting it read-write. Only in this case, nobody has a chance to know that something is amiss, and since you probably are letting this happen automatically at OS startup, the chances of a RO mount being followed by a RW one are about the same as the other way 'round. You're going to have the problem regardless of whether mount pays attention to the clean flag. If you are worried about a RO mount getting corrupted, don't modify the partition out from under it on another machine. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message