Re: persistent removed MD referrence on reboot
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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(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
Did you update the initrd file? This file probably contains a copy of the mdadm.conf================================ $ ls /etc/mdadm/mdadm.conf ls: cannot access /etc/mdadm/mdadm.conf: No such file or directory ================================
Also, did you modify the partition type, from fd to 83I 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 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html