2 SCSI Controllers
jludwig
wralphie at comcast.net
Thu Apr 29 14:32:01 UTC 2004
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 at comcast.net>
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