Solved

fatal: open /dev/sdc: no such device or address:  WHY?

Posted on 2008-06-13
3
1,673 Views
Last Modified: 2016-10-27
I'm in the process of upgrading the disks on my server. (Dell PowerEdge 2300 with Adaptec 2110s controller) Old setup: 4 36G RAID 5  + 1 137G for backups of user folders. I used Acronis Enterprise to make a backup of my partitions to another 137G drive. I replaced the old 36's with 4  new 137G's. Created the new array RAID5, again booted from CD to Acronis, restored the main partition of about 100GB and the 2G swap.

The first problem came when, after the upgrade,  the SCSI controller labeled my RAID array as sdb instead of sda as it used to be. This is because in the physical order of disks inserted into the Dell backplane, the Acronis backup 137G drive is first (slot 0,0), the RAID disks are next (slots 0,1 - 0,4) and the users backup drive, 137G, is last (slot 0,5). Since my boot disk USED to be sda, I booted from a CD, mounted sdb1, chroot to /mnt/sdb1, changed /etc/fstab and /etc/lilo.conf to point to sdb instead. I ran /sbin/lilo and it seemed to write the mbr. It never found LILO with that configuration, I believe (it's tough to remember everything when you try so many different things)

So.... I physically removed drive in slot (0,0) the Acronis backup. It is unneeded now since I restored already. Now, SCSI controller sees my array as sda and backup drive as sdb. I again booted from CD, mounted sda1, chroot-ed to /mnt/sda1 and modified fstab and lilo.conf back to pointing to sda. This time, when I ran /sbin/lilo, I get:

-----------------------------
Warning LBA32 addressing assumed
raid_setup returns offset = 00000000 ndisk = 0
BIOS    VolumeID    Device
Reading boot sector from /dev/sda
Fatal: open /dev/sdc: No such device or address
-----------------------------

 I tried  running lilo -v -v, didn't help
0
Comment
Question by:RickNCN
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 6

Accepted Solution

by:
akirhol earned 500 total points
ID: 21785823
I don't use LILO [prefer GRUB myself] so this is a shot in the dark, but is /dev/sdc still in your fstab or lilo.conf anywhere at all? With only 2 drives, /dev/sdc will no longer be in use.

This would be similar to how GRUB installs, it will throw an error if anything is listed in /etc/mtab that does not exist.
0
 

Author Comment

by:RickNCN
ID: 21786353
no, that's the weird thing, there are no references to sdc in fstab or lilo.conf!. My friend thinks maybe the system map is corrupt. He suggested reinstalling Slack. But that will entail a kernel upgrade. We've been using slack 9.1 which comes with 2.4.22 and it's been updated to kernel 2.4.23 I think - for multi processor support.  I really don't want to reinstall. Can you think of any other reason for this at all?
0
 

Author Closing Comment

by:RickNCN
ID: 31466985
Well, we couldn't figure out what the problem was so we went ahead and saved the etc directory and loaded slack 12.1 and restored etc and the conf  files. So - no resolution, but you gave some good suggestions. Thanks
0

Featured Post

Simplifying Server Workload Migrations

This use case outlines the migration challenges that organizations face and how the Acronis AnyData Engine supports physical-to-physical (P2P), physical-to-virtual (P2V), virtual to physical (V2P), and cross-virtual (V2V) migration scenarios to address these challenges.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Microsoft will be releasing the Windows 10 Creators Update in just a matter of weeks. Are you prepared? Follow these steps to ensure everything goes smoothly and you don't lose valuable data on your PC.
Ransomware continues to grow in reach and sophistication, putting data everywhere at risk. Learn how to avoid being caught in its sinister clutches with these 11 key tips.
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
Suggested Courses

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question