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Old 10-03-2006, 11:06 AM   #1
pixellany
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Seeing hard drive differently


To do some testing, I put the latest MEPIS on my office computer:
Dell 360 Workstation, 3.2GHz P-IV, 1GB RAm 73GB SCSI harddrive. (Only ONE drive!!)

The normal system (RHEL4) sees the drive as /dev/sda. The Mepis installer sees it the same way.
Setup was:
sda1: RHEL4 /boot
sda2: RHEL4 /
sda3: swap
During Mepis install, I added sda4 for Mepis /

HOWEVER: When booting, Mepis could not mount the root filesystem. After watching it boot up a few times, i noticed that it was detecting /dev/sdb. I changed the grub.conf file to point the kernel to /dev/sdb, and everything works

grub.conf entry for Mepis:
root (hd0,3)
kernel /boot/vmlinuzxxxx root=/dev/sdb4
initrd /boot/initrdxxxx

So--somewhere in the bootup, it decides that the first hd is really sdb......

Any ideas?
 
Old 10-04-2006, 05:59 PM   #2
stress_junkie
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Do you have anything connected in a USB port like a camera or a thumb drive?
 
Old 10-04-2006, 06:54 PM   #3
pixellany
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Quote:
Originally Posted by stress_junkie
Do you have anything connected in a USB port like a camera or a thumb drive?
Yes, but never has caused an issue like this.
I'll check to eliminate this variable (but I think that fdisk -l did no show any sda--only sdb)
 
Old 10-04-2006, 08:42 PM   #4
stress_junkie
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I'm not familiar with Mepis but I'm guessing that it starts up like (almost) every other Linux. I mean that it's not like Sentry Firewall CD that starts up using PHP scripts. The fact that it's a fresh install eliminates things like udev remapping the device.

One thing that happened with a recent installation of OpenSuSE that may relate to this. I installed OpenSuSE with a USB disk drive and a USB mouse attached. This caused a problem with the installer incorrectly mapping the cdrom drive to a SCSI address. I wonder if you had any USB devices attached while you were installing Mepis and if that would have affected your initrd configuration.

Other ideas are the same old same old. Run lsscsi and lspci. If you have the hwinfo utility then run that. Pipe the output to a file and read it using less. Look in the /proc directory. Here are some ideas on that. I don't have any SCSI disks so I probably don't have the same directory structure as you.
Code:
cat /proc/devices
ls /proc/scsi  # I don't have a /proc/scsi but you might.
ls /sys/devices
Well, you get the idea. If I had any SCSI disks I could identify pertinent files but I figure where you see an ide directory you will probably also see a scsi directory in the /proc and /sys trees. The pseudo-files in there can be informative.
 
Old 10-06-2006, 12:20 AM   #5
pixellany
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It looks as if it was the USB Zip Drive.

On home machine, I recently installed two SATA drives and have installed all manner of distros with no issues (various things on USB, including 2 external drives)

Why the office box (SCSI), with the USB Zip, has an issue ONLY WITH MEPIS???

This simply confirms my assertion that computers are not deterministic.
 
Old 10-06-2006, 10:49 AM   #6
stress_junkie
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I hate a computer that is into Henry Thoreau.

Last edited by stress_junkie; 10-06-2006 at 10:51 AM.
 
  


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