Re: 2 SCSI Controllers

From: jludwig (wralphie_at_comcast.net)
Date: 04/29/04

  • Next message: dhananjoy chowdhury: "Re: Why oh why XMMS?" 
    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Thu, 29 Apr 2004 10:32:01 -0400

    On Thu, 2004-04-29 at 09:29, Jeff Vian wrote:
    > Götz Reinicke wrote:
    >
    > >
    > >
    > > Alexander Dalloz schrieb:
    > >
    > >> Am Do, den 29.04.2004 schrieb Götz Reinicke um 12:07:
    > >>
    > >>
    > >>> Hi,
    > >>>
    > >>> I have an Dell PE 1650 Server with an internal perc 3/di SCSI RAID
    > >>> Controller hosting a RAID 1 and an Adaptec 29160 Controller hosting
    > >>> an external Hardware RAID-Box.
    > >>>
    > >>> If I boot, and try to install Fedora, the external RAID is seen as
    > >>> sda, the internal RAID as sdb.
    > >>>
    > >>> How can I change this order, so that the internal RAID is sda and
    > >>> the external RAID is sdb? Any ideas?
    > >>>
    > >>>
    > >>> Regards
    > >>>
    > >>> Götz Reinicke
    > >>
    > >>
    > >>
    > >> Just change the SCSI ID of the RAID arrays/drives. The lowest is sda,
    > >> the second... Remembering your previous post about difficulties with an
    > >> external SCSI driver array of SATA drives I guess you can specify the
    > >> SCSI ID for the whole external box.
    > >
    > >
    > > I do have different IDs, 0 for the internal RAID, 1 for the external
    > > RAID-Box. The later is attached to a different SCSI Controller.
    > >
    > > But the external Box is seen as sda :-(
    > >
    > This is because of the sequence in which the cards are seen/configured
    > on the PCI bus, as well as the scsi bus ID sequence. The scsi ID is not
    > the only thing it looks at to decide what name it gives the drive.
    >
    > The general rule to decide what device gets what name is first
    > configured controller, scsi id sequence on that bus, then next
    > configured controller, scsi id sequence on that bus, etc.
    >
    > Thus, you can have a controller in pci slot 1 and another in slot 3. If
    > the controller in slot 3 is configured first its drives take precedence
    > over those on the controller in slot 1.
    >
    > If you have devices on a single controller, AFAIK they will always get
    > configured in id sequence.
    > This can become a problem if you leave gaps in the scsi IDs then later
    > add another device that fills that ID slot. the drives at the later IDs
    > will get the name changed.
    >
    > For example, you have a single scsi drive at ID 4. this will by default
    > be named sda. Then you add another drive at ID 0. Now that new drive
    > will be sda and the original becomes sdb. This effect can be a bit
    > disconcerting at times if not expected.
    >
    > >
    > > so long...
    > > ...Götz
    Have you considered labels for the drives? 

    -- 
jludwig <wralphie@comcast.net>
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