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List:       linux-hotplug
Subject:    Re: How to make a SCSI disk sda instead of SATA disks?
From:       David Zeuthen <david () fubar ! dk>
Date:       2007-10-20 0:09:30
Message-ID: 1192838970.14591.2.camel () oneill ! fubar ! dk
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On Fri, 2007-10-19 at 21:44 +0000, Carl Perry wrote:
> I have a system with a SCSI boot drive, and a series of SATA data drives.  It's
> running Debian Etch AMD64.  Currently, udev seems to be making devices for the
> SATA drives before making devices for the SCSI drives.  I'd like to make this go
> the other way around, or get a different device name for the SCSI disk.  The
> number of SATA drives has been known to change, and currently I need to update
> /etc/fstab every time the number of SATA drives do change because that moves
> where the SCSI drive appears.
> 
> I've tried adding a rule so that the model number of the SCSI drive is assigned
> to sda, but that was ignored.  I've also tried forcing module load order to the
> aic79xx controller before the sata_sil controller.  The SATA drives still had
> their devices created first, with the SCSI drive appearing as sdc.
> 
> Any help would be appreciated.  Thanks!

Relying on the assumption that the kernel-given names will remain stable
is a losing proposition; it's just not going to work. Instead, just use
the symlinks in /dev/disk/* instead; for example that's what I do for my
SATA disk tower

  $ cat /etc/mdadm.conf 
  DEVICE /dev/disk/by-id/scsi-SATA_WDC_WD5000AAJS-_WD-WCAPW0295169
  DEVICE /dev/disk/by-id/scsi-SATA_WDC_WD5000AAJS-_WD-WCAPW0594845
  DEVICE /dev/disk/by-id/scsi-SATA_WDC_WD5000AAKS-_WD-WCAPW0493929
  DEVICE /dev/disk/by-id/scsi-SATA_WDC_WD5000KS-00_WD-WCANU1914880
  DEVICE /dev/disk/by-id/scsi-SATA_WDC_WD5000KS-00_WD-WCANU2209762

  ARRAY /dev/Fusion500P uuid=c5fc394c:f33279ab:7630b1ba:099a5109 auto=md

Hope this helps,
David



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