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Old 12-23-2016, 03:28 AM   #1
Registered: Jul 2009
Distribution: Archlinux
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RAID ddf signature infects new hard drives like a virus

Hi. I had RHEL6.8 installed on a fake RAID1 on a machine with Intel Matrix Raid controller.
The array was built out of two 300Gb hard drives and managed by dmraid

At one point I needed to boot the machine from another non-empty 500Gb HDD. I replaced the drive in the first slot and turned the power on. Guess what, it kicked me into the recovery shell, because it could not mount the "/boot" entry from fstab, because the logical device sda1 disappeared during boot! sda2 was there and mounted just fine.

I removed the drive from the second slot, but it was already too late: the RAID metadata was copied to my 500Gb disk and during boot dmraid complained that it could not activate ddf...
It was dmraid who kept deleting sda1 during boot.

Later I found the solution here, but now I just want to know who spoiled the new hdd, BIOS or the OS. One of them was too smart and automatically treated it as a spare, although it was non-empty and had different size

Last edited by leniviy; 12-23-2016 at 03:45 AM.
Old 12-23-2016, 04:20 AM   #2
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Somebody configured the BIOS to associate the drives and write meta-data to them. Which Linux drivers (dmraid and/or mdadm) then recognise.

I'd reckon that somebody would have to shoulder the "blame".
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dmraid, rhel 6

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