Server refuses to boot when Raid5 disk is disconnected - /root/ missing

Posted by Ronni on Server Fault See other posts from Server Fault or by Ronni
Published on 2012-03-13T08:18:14Z Indexed on 2012/03/21 5:31 UTC
Read the original article Hit count: 131

Filed under:

debian

|

raid

|

nas

I recently set up a NAS server running a Debian OS (6.0.4)

It contains 4 disks, 3 of them are in a Raid5 array, while the last one is used for the OS.

To simulate a disk-failure I unplugged one of the raid disks, which resulted in the OS being unable to boot.

It started the boot, recognized that md0 (the raid array) was running on 2/3 disks, and then threw a few errors.

It was unable to find the following directories:

/dev/root on /root,
/dev on /root/dev,
/sys on /root/sys,
/proc on /root/proc

It appears this happens regardless of which raid disk is removed. These directories are supposed to be on /dev/sdd my system disk.

Output from fstab and blkid : http://dl.dropbox.com/u/6017799/NASOutput.txt

If you need additional info, please let me know.

© Server Fault or respective owner

Related posts about debian

Trying to update debian not working

as seen on Super User - Search for 'Super User'
As root i type this command apt-get update and get these error messages. > Err http://security.debian.org lenny/updates Release.gpg Could not resolve 'security.debian.org' Err http://security.debian.org lenny/updates/main… >>> More
Trouble with dns and debian update

as seen on Server Fault - Search for 'Server Fault'
I tried to update my debian dreamplug server with the command running as root apt-get update and recieved these errors. Err http://security.debian.org lenny/updates Release.gpg Could not resolve 'security.debian… >>> More
Errors when installing Open Office

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I followed the first set of instructions on this page to install Open Office: How to install Open Office? However, the last step which says to change the CHMOD of a folder, I got an error saying that the directory does not exist. Open Office now appears in my Ubuntu start menu, but clicking… >>> More
Installing PHP4 on a Debian (lenny) 7 32bit box

as seen on Server Fault - Search for 'Server Fault'
I am trying to install PHP4 on a Debian 7 32bit box but I ran into the following root@php4:~# apt-get update Get:1 http://snapshot.debian.org lenny Release.gpg [189 B] Hit http://snapshot.debian.org lenny Release Ign http://snapshot.debian.org lenny Release Hit http://snapshot.debian.org lenny/main… >>> More
Debian keyring error: "No keyring installed"

as seen on Server Fault - Search for 'Server Fault'
I have a Debian Squeeze EC2 AMI. On booting up an instance with it and trying to install packages with apt-get I get errors saying there is no keyring installed. Here is the error with apt-get update: root@ip:~# apt-get update Get:1 http://ftp.us.debian.org squeeze Release.gpg [1672 B] Ign http://ftp… >>> More

Related posts about raid

Booting from integrated RAID controller when another RAID controller is installed in a PCIe slot

as seen on Server Fault - Search for 'Server Fault'
I have a GA MA785GT UD3H motherboard with Windows Server 2008 R2 installed on a RAID1 using the on-board RAID controller. I have now installed a RocketRaid 2680 controller and set up a RAID5 for all my data to be stored on. Unfortunately I now cannot boot from the RAID1 anymore, the PC is trying… >>> More
Onboard RAID vs Software RAID

as seen on Server Fault - Search for 'Server Fault'
My motherboard, an Asus M4a79t Deluxe, advertises RAID 0/1/5 capabilities. My limited understanding is that onboard RAID is better than software RAID. Is this necessarily true? Is an onboard RAID controller closer in performance to a software controller or a dedicated hardware controller? >>> More
RAID-1 and regular drive removal (using RAID-1 as a backup measure)

as seen on Super User - Search for 'Super User'
Is using mdadm's RAID-1 of 2 partitions (one on laptop's internal HDD, one on external HDD) a good idea. I want the system to work as RAID-1 if both drives are present, work as regular volume (degradad RAID-1) if external HDD is unplugged and quickly resync when I plug external HDD again. Questions: Is… >>> More
Explain difference in SQLIO numbers for RAID 0 versus RAID 5 over 6 disks

as seen on Stack Overflow - Search for 'Stack Overflow'
When using the SQLIO benchmark tool on a 4-core Dell server with 6 15k 450GB (fast) drives, RAID 0, we found the max throughput was 2MB per second. But when configured as RAID 5, we get 30 MB per second. It seems that the RAID controller, Dell Perc 5i integrated controller, is maxing out the… >>> More
RAID 5 RECONSTRUCT with RAID Reconstructor

as seen on Server Fault - Search for 'Server Fault'
I have Dell Poweredge server 2600 with Raid 5 in 3 hard drive Scsi 36gb each, it was fail to boot sinc the third drive is offline. I attached Sata card adapter to Sata hard drive and install OS SERVER 2003 to it, downloaded drivers for Raid and everything goes fine when I use recovery data software… >>> More