Date: Sat, 09 Aug 1997 02:43:52 -0700 (PDT) From: Simon Shapiro <Shimon@i-Connect.Net> To: filo@yahoo.com Cc: freebsd-scsi@freebsd.org Subject: Re: strange difference between DPT and Adaptec Message-ID: <XFMail.970809024352.Shimon@i-Connect.Net> In-Reply-To: <199708050238.TAA28428@ns2.yahoo.com>
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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
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