On 1/08/12 11:43 AM, Skip Coombe wrote:
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.
I think Adam led you to the right path. Your reference to 12-4 leads me
to guess that you're running Ubuntu 12.04? For me on these systems, I
would do the following:
- zero superblocks:
sudo mdadm --zero-superblock /dev/sdc1
running that commands multiple times until they return "No superblock
found" or similar message. Once you get that response, there are no
mdadm superblocks remaining.
- update /etc/mdadm/mdadm.conf to remove references to old md arrays.
- update initramfs:
update-initramfs -u
From there you should be able to reboot and find only those arrays
specified in mdadm.conf (also arrays auto-built by the kernel from
devices with partitions of type fd). If you're still not getting the
expected outcome, pls send the output of "parted -l" and
/etc/mdadm/mdadm.conf, uname -a, mdadm -V
HTH
j
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
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