Date: Sat, 31 Jul 2004 16:05:54 -0400 From: Michael Grant <mg-fbsd3@grant.org> To: Pete French <petefrench@ticketswitch.com> Cc: freebsd-stable@freebsd.org Subject: Re: How does CAM determine the order to number drives ? Message-ID: <20040731200554.GA14912@grant.org> In-Reply-To: <E1BqzUU-000N79-DE@dilbert.firstcallgroup.co.uk> References: <E1BqzUU-000N79-DE@dilbert.firstcallgroup.co.uk>
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Yes, I know this situation all to well. In my case, I ended up physically plugging and unplugging drives until they ended up in the right place. I would sure love to see a way to fix a drive to an identifier. This has to be the one thing that has wasted more of my time than anything else in freebsd. For example, when I had a drive die on me a couple months back, when the machine rebooted, the dead drive still in the system, da2 became da1 and things just did not work well. If someone knows of a way to tie physical drives to the nodes in /dev, please let me know. I've heard that this auto drive numbering is a bios "feature" which is impossible to get around. Michael Grant On Sat, Jul 31, 2004 at 08:25:58PM +0100, Pete French wrote: > Hi, I have a small server which boots from an > Adaptec 2940 controller under CAM, and serves drives > off a Compaq 4200 RAID controller. > > I have spent the afternoon ttrying to upgrade the > RAID controller from a 4200 to a 5300. The 5300 uses > the CISS driver rather than the IDA driver, and this > lives under CAM too. Thus my RAID drives have changed > from being idad devices to being da devices. > > Unfortunately the RAID controller gets scanned first > so I now have a da0 and a da1 where I didnt before, and my > root drive has moved to da2. > > I can't persuade it to boot like this - it refuses to mount > the root from da2. The simplest solution, of course, would > be to somehow force the CAM system to scan the Adaptec > controller first, so that the root device is back in da0 > where it belongs. But I cant find out if there is a way > of dojing this, or indeed how the system determines the order > at all. > > Any suggestions ? > > -pcf. > > PS: System is 4.10-RELEASE, though I suspect this is irrelevent > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
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