Re: How does CAM determine the order to number drives ?

From: Dmitry Morozovsky (marck_at_rinet.ru)
Date: 07/31/04

  • Next message: Matthew Seaman: "Re: How does CAM determine the order to number drives ?" 
    Date: Sun, 1 Aug 2004 00:15:30 +0400 (MSD)
To: Michael Grant <mg-fbsd3@grant.org>

    On Sat, 31 Jul 2004, Michael Grant wrote:

    MG> Yes, I know this situation all to well. In my case, I ended up
    MG> physically plugging and unplugging drives until they ended up in the
    MG> right place.
    MG>
    MG> I would sure love to see a way to fix a drive to an identifier. This
    MG> has to be the one thing that has wasted more of my time than anything
    MG> else in freebsd. For example, when I had a drive die on me a couple
    MG> months back, when the machine rebooted, the dead drive still in the
    MG> system, da2 became da1 and things just did not work well.
    MG>
    MG> If someone knows of a way to tie physical drives to the nodes in /dev,
    MG> please let me know. I've heard that this auto drive numbering
    MG> is a bios "feature" which is impossible to get around.

    root_disk_unit="2"

    in /boot/loader.conf ?

    MG>
    MG> Michael Grant
    MG>
    MG> On Sat, Jul 31, 2004 at 08:25:58PM +0100, Pete French wrote:
    MG> > Hi, I have a small server which boots from an
    MG> > Adaptec 2940 controller under CAM, and serves drives
    MG> > off a Compaq 4200 RAID controller.
    MG> >
    MG> > I have spent the afternoon ttrying to upgrade the
    MG> > RAID controller from a 4200 to a 5300. The 5300 uses
    MG> > the CISS driver rather than the IDA driver, and this
    MG> > lives under CAM too. Thus my RAID drives have changed
    MG> > from being idad devices to being da devices.
    MG> >
    MG> > Unfortunately the RAID controller gets scanned first
    MG> > so I now have a da0 and a da1 where I didnt before, and my
    MG> > root drive has moved to da2.
    MG> >
    MG> > I can't persuade it to boot like this - it refuses to mount
    MG> > the root from da2. The simplest solution, of course, would
    MG> > be to somehow force the CAM system to scan the Adaptec
    MG> > controller first, so that the root device is back in da0
    MG> > where it belongs. But I cant find out if there is a way
    MG> > of dojing this, or indeed how the system determines the order
    MG> > at all.
    MG> >
    MG> > Any suggestions ?
    MG> >
    MG> > -pcf.
    MG> >
    MG> > PS: System is 4.10-RELEASE, though I suspect this is irrelevent
    MG> > _______________________________________________
    MG> > freebsd-stable@freebsd.org mailing list
    MG> > http://lists.freebsd.org/mailman/listinfo/freebsd-stable
    MG> > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
    MG> _______________________________________________
    MG> freebsd-stable@freebsd.org mailing list
    MG> http://lists.freebsd.org/mailman/listinfo/freebsd-stable
    MG> To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
    MG>

    Sincerely,
    D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
    ------------------------------------------------------------------------
    *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
    ------------------------------------------------------------------------
    _______________________________________________
    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"

  • Next message: Matthew Seaman: "Re: How does CAM determine the order to number drives ?"

    Relevant Pages