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CentOS 5.5 does not boot past this point:

centos 5.5 os doesnt boot past this point

This machine has an Areca RAID controller with the OS on a RAID 1 mirror made from 2 SATA drives. There is a second array as well; a RAID 5 group with 4 SATA drives.

Based on the error message, what could possibly be wrong here?

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migrated from stackoverflow.com Sep 23 '11 at 19:17

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You should ask this on unix.stackexchange.com –  Oded Sep 23 '11 at 19:15
    
Why is this not relevant for serverfault? Is unix.stack... new? Is there meta documentation somewhere that says which to post in when? –  Andrew Case Sep 24 '11 at 3:26
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2 Answers 2

You propably don`t have the right driver loaded in you initrd.

Apart from that - from your screenshot I only see 4 drives on 2 controllers. "SATA link down" does not look good. So you system can find 4 SATA drives but can`t access them.

What Linux distribution are you using, which version?

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What did you change before the reboot? Why the machine rebooted?

From what's on the screen there are 2 SATA controllers in the box, each with 2 drives plugged in. From your description, there should be 2 and 4 disks. Two disks have disappeared somewhere. Can you determine, why there are only 4 disks visible, instead of 6? Does re-plugging help? What does your raid controller say about the arrays?

Still, it's strange. If the boot disk disappeared, then where the kernel boot from? If the non-boot disks disappeared, why didn't the boot progress to the stage where a mount of some filesystem fails? If one disk from each group is gone, there shouldn't be any arror at the OS level at all... Something's very strange here.

Try re-booting again, but remove quiet option from grub command line, this should provide more information.

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