OpenMediaVault RAID 5 Missing and Rebuilding

1. Phenomenon description

The system fails to start normally as:

1. Entering the password will enter rescue mode

2. Press Ctrl + D to enter normal mode

3. After entering the password to enter the rescue mode, enter the journaljl -xb in the terminal to view the system log. You can see that it is due to a disk error /dev/sdc. Requires manual repair.

4. Press Ctrl + D to enter the normal mode, enter the host IP address to view in the browser, enter the Storage -> RAID Management option, you can see that the status changes from the normal clean to clean degrade, the devices From the normal /dev/sdb /dev/sdc /dev/sdd to /dev/sdb/dev/sdd, it can be seen that RAID 5 is lost due to the /dev/sdc error.

5. Enter the Storage -> File Systems option,/dev/md0, no auto mount

II. Solution

1. First, restart the system, enter the password to enter the rescue mode, and enter the following command in the terminal:

   fsck -y /dev/sdc

   Among them, sdc is replaced with your wrong disk, or you don’t know what went wrong, you can also use the following command:

   fsck -y /dev/sdb /dev/sdc /dev/sdd

   Just enter all your RAID devices

2. After the disk is repaired, let’s rebuild RAID 5. At this time, the web-side RAID management that comes with OpenMediaVault is not feasible. You need to use a terminal command to operate.

3. Add the missing device:

   mdadm /dev/md0 --add /dev/sdc

4. Stop RAID

   mdadm --stop /dev/md0

5. Reassemble RAID 5

   mdadm --assemble /dev/md0 /dev/sd[bcd] --verbose --force

   Then you can see the system is rebuilding RAID 5