From owner-freebsd-questions Fri Jan 26 17:15:14 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id RAA11477 for questions-outgoing; Fri, 26 Jan 1996 17:15:14 -0800 (PST) Received: from cs.pdx.edu (root@cs.pdx.edu [131.252.20.183]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id RAA11472 for ; Fri, 26 Jan 1996 17:15:11 -0800 (PST) Received: from sirius.cs.pdx.edu (root@sirius.cs.pdx.edu [131.252.20.199]) by cs.pdx.edu (8.7.3/CATastrophe-12/23/94-P) with ESMTP id RAA13725; Fri, 26 Jan 1996 17:15:02 -0800 (PST) for Received: from localhost (jrb@localhost.cs.pdx.edu [127.0.0.1]) by sirius.cs.pdx.edu (8.7.3/CATastrophe-9/18/94-C) with ESMTP id RAA09501; Fri, 26 Jan 1996 17:15:01 -0800 (PST) for Message-Id: <199601270115.RAA09501@sirius.cs.pdx.edu> To: questions@freebsd.com Subject: how can I copy wd0 to wd1 Date: Fri, 26 Jan 1996 17:15:00 -0800 From: Jim Binkley Sender: owner-questions@FreeBSD.ORG Precedence: bulk I have two identical 1G ide drives, wd0, wd1. I want to back up all of wd0 to wd1 periodically, say nightly. When I tried: dd if=/dev/rdw0c of=/dev/rdw1c bs=some chunks here I was told: dd: /dev/rwd1c: Read-only file system Why is this and what might be the best way of doing this anyway? I want wd1 to end up as a clone of wd0 in case of a crash. regards, Jim Binkley jrb@cs.pdx.edu