Phantom Entry when scanning with mdadm.conf
My system is down right now, so it's difficult to get exact file info (I have to type everything on a laptop).
I was running RAID5 on my system to create two md's (/dev/md0 and /dev/md1). 5 drives were divided up into two partitions each. I had 4 data drives + 1 parity.
When I run
mdadm --examine --brief --scan --config=partitions
I get the two entries in /etc/mdadm/mdadm.conf PLUS a third entry from somewhere else. The extra entry appears to be an OLD entry that must be embedded on the disks somewhere. I can't figure out how to get rid of it.
So this may have led to a failure- upon rebooting today the /dev/md0 array appears to have accessed the wrong entry and started to rebuild itself with the three drives (2+1) rather than the correct one (4+1).
Is there any way to try and recover that array?
Follow up info
If I run
The /etc/mdadm/mdadm.conf file only contains the last two entries, so I assume that the first is my old config that was not properly deleted when I revamped my system earlier this year.
I want to remove the first entry. Is there anyway to do this? If I use the examples I have seen, they only specify the device with /dev/md0, not the UUID.
How can I find out WHERE the entry (superblock) exists, and how to zero out just that one?
At one point today, when I rebooted, the system used that first entry and automatically started to rebuild the OLD array. I stopped the array as fast as I could, and it appears that things are OK. But I am scared to reboot into an automatic state!
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