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Openmediavault assemble raid6 with mdadm

Sanaf

2/28/23, 8:45 AM

I have a raid 6 with 1 hot spare. I the initial config was with 5 6TB drives then I added 2 more 6TB drives with the openmediavault web interface. Everything was fine after that. But the last time when I added an other 6 TB drive, initially there were no problem but after 4-5 Hours of reshaping the drive stopped working. And now the array is inactive and I can't reactive the array.

I haven't partitioned my drive. And also my web interface is not working.

I have tried.

$ mdadm --stop /dev/md127

# Then tried to remove the faulty drive by.
$ mdadm --manage /dev/md127 --fail /dev/sde
$ mdadm --manage /dev/md127 --remove /dev/sde

# And then I then I tried to reassemble the array with.\
$ mdadm --assemble --scan # and it gives this output
mdadm: /dev/md/RD6 assembled from 3 drives and 1 spare - not enough to start the array.

My /etc/mdadm/mdadm.conf

ARRAY /dev/md/RD6 metadata=1.2 UUID={UUID} name=younus:RD6
    spares=1

140

0 + 0

raid

storage

debian

mdadm

software-raid

NiKiZe

2/28/23, 8:52 AM

run `mdadm -E /dev/sd*` Make sure you get output for all devices. you might be able to assembly by giving each device (in correct order) with a `missing` in the correct place.

Sanaf

2/28/23, 9:09 AM

So, I tried ```mdadm --assemble /dev/md127 --force /dev/sd[a-j]``` But it gives me ```mdadm: /dev/sda is busy - skipping``` for every drive.

NiKiZe

2/28/23, 11:29 AM

Assembly on all devices is NOT a good idea, you need to have the order correct. That is why I requested -E output --examine

Nikita Kipriyanov

2/28/23, 11:52 AM

What a mess. It lists everything as a spare.

Nikita Kipriyanov

2/28/23, 12:43 PM

Did you checked the health of all disks in question? I don't care with the one which is not the array member, but check at least SMART of all 8 other devices. If you notice any errors or problems like relocation events, relocated, unreadable sectors, and so on, don't proceed with this set of drives. I started writing an answer and realized if some device is faulty you'll likely destroy all the data if you attempt to assemble an array.

Nikita Kipriyanov

2/28/23, 12:45 PM

Here "busy" means a device is already detected and claimed as a component of the array, while you tried to add it again. // Show us a real examine output for each array component (this will actually read MD superblocks from them and present in a human-readable form).

Sanaf

2/28/23, 5:44 PM

@NiKiZe here is the output. http://ix.io/3DbM

Sanaf

2/28/23, 8:13 PM

Yes, previously 3 of my drive has SMART error and the last one has SMART error now, so total 4. They were ok when I added them. But the error occurred when the array was reshaping. I thought that it wasn't a big deal because all of them were working fine.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Openmediavault assemble raid6 with mdadm

TH: Openmediavault รวบรวม Raid6 ด้วย mdadm

RO: Openmediavault asambla raid6 cu mdadm

RU: Openmediavault собирает raid6 с помощью mdadm

VI: Openmediavault lắp ráp RAID6 với mdadm

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