Thanks for the quick response.
I did "dd -if=/dev/zero -of=/dev/sdc" and modified the the partition to 83.
Today I followed your advice to investigate initrd. I deleted all the
ARRAY specs from /etc/mdadm/mdadm.conf (they were
from the time of installing 12-4, including the md2 ARRAY), wrote the
new initrd, and rebooted.
The reference to md2 went away, but now I see
======================
$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md127 : inactive sdc[1](S)
488385560 blocks super 1.2
unused devices: <none>
======================
I will repeat after "rm -rf /etc/mdadm" from the initrd dir tree. If
that does not work I will probably just reinstall 12-4. I hate to do
all the config again, but I've burned too many hours on this already.
There are no superblocks left so I hope to get a clean start.
n.b. md127 seems to be the default array, but still sdc is identified.
There must be more info buried in the initrd.
Thanks for the good advice, but I am still missing something.
Skip
On Mon, Jul 30, 2012 at 9:26 PM, Adam Goryachev
<adam@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> On 07/31/2012 11:02 AM, Skip Coombe wrote:
>>
>> I have an md entry referring to a badly removed RAID1 device (by me) after
>> the associated device crashed (can't afford a replacement drive at this
>> time).
>> Despite attempts to remove the reference, after a reboot I see:
>>
>> ================================
>> $ cat /proc/mdstat
>> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
>> [raid4]
>> [raid10]
>> md2 : inactive sdc[1](S)
>> 488385560 blocks super 1.2
>>
>> unused devices: <none>
>> ================================
>>
>> I am trying to repurpose the good drive as a not-RAID device. I have done
>> sudo mdadm --zero-superblock /dev/sdc
>> and
>> sudo mdadm --zero-superblock --force /dev/sdc
>> and even low level formatted /dev/sdc
>
> What do you mean "low level formatted"? Have you done a
> dd if=/dev/zero of=/dev/sdc
>
>> ================================
>> $ ls /etc/mdadm/mdadm.conf
>> ls: cannot access /etc/mdadm/mdadm.conf: No such file or directory
>> ================================
>
> Did you update the initrd file? This file probably contains a copy of the
> mdadm.conf
>
> Also, did you modify the partition type, from fd to 83
> I would suggest running the above dd command, which will erase ALL traces of
> anything, including any data on the drive (so back it up elsewhere first).
>
> Most likely, the md code looks at a couple of different places on the drive
> for the md information, so when you run the zero-superblock, it is only
> erasing one of the possible locations. See man mdadm, especially the
> --metadata section.
>
> Regards,
> Adam
--
Skip Coombe
skip.coombe@xxxxxxxxx
919.442.VLSI
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