From owner-freebsd-scsi Sat Aug 9 02:43:50 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id CAA16540 for freebsd-scsi-outgoing; Sat, 9 Aug 1997 02:43:50 -0700 (PDT) Received: from sendero-ppp.i-connect.net (sendero-ppp.i-Connect.Net [206.190.143.100]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id CAA16514 for ; Sat, 9 Aug 1997 02:43:40 -0700 (PDT) Received: (qmail 17372 invoked by uid 1000); 9 Aug 1997 09:43:52 -0000 Message-ID: X-Mailer: XFMail 1.2-alpha [p0] on FreeBSD Content-Type: text/plain; charset=iso-8859-8 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <199708050238.TAA28428@ns2.yahoo.com> Date: Sat, 09 Aug 1997 02:43:52 -0700 (PDT) Organization: Atlas Telecom From: Simon Shapiro To: filo@yahoo.com Subject: Re: strange difference between DPT and Adaptec Cc: freebsd-scsi@freebsd.org Sender: owner-freebsd-scsi@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Sorry for the delay. Was very, very busy. I respond to mail on demand but sometimes forget to read the list. Sorry. Hi David Filo; On 05-Aug-97 you wrote: ... > The drive in question was not in a raid array, but was target 0 on bus > 0 (only one controller is used). BTW, the problem persists if > original drive is moved to target 1 bus 0, with a boot disk at target > 0. I really do not remember the details, but b0t0 is definitely a special case. If the DPT firmware thinks your drive is a new addition, it ignores all these special meanings. If not, it will confuse things. Report it as a bug to DPT support. ... > I've noticed this when trying to build arrays from scratch using > drives that used to be in arrays. I learned that you need to delete > the arrays with dptmgr before rearranging things. Yup. Only sometimes this is not an option. I always keep an Adaptec on hand. For one thing it knows to lowlevel format the drives without booting an O/S. I may be able to release a DPT firmware that does that. I need to certify it and get permission to post it. ... > Okay, but i still don't understand what's going on. When we buy > drives we don't low-level format them. Just plop them in and run > fdisk, disklabel, and newfs. No problems to date. I have never seen a problem with new drives either. Just taking a drive that has filesystems, partitions, etc. seems to be a good way to ruin a weekend. > Will low-level format reserve space in the DPT case? Does extra space > need to be reserved with fdisk for the DPT? I do not know. No. > Does this mean you can't clone a machine by simply dd'ing the disk if > the destination adapter (say DPT) was not used to build the original > disk (say 2940)? Again, i hesitate to answer this one. I clone systems with DPT for DPT, Adaptec for Adaptec. Well, I do not clone systems, Manufacturing does... I can ask. Simon