Hello,

I had a defective hard disk and therefore removed it and inserted a new one. The new one has already been checked in the past, so I started the rebuild based on parity. After 3 days, the rebuild has now been successfully completed, but the hard disk cannot be mounted in the array because there is no file system.
Is there a way to format the hard disk without having to rebuild it or can I at least start the rebuild again after formatting?

Regards,

Felix

raider-diagnostics-20240124-2357.zip

Edited January 24, 20242 yr by seyz

You can format the disk at any time, but doing that will delete all data there, and rebuilding after won't help, since it will rebuild the newly formatted disk.

 

No valid filesystem is being detected on disk1, assuming the disk was xfs formatted, start the array in maintenance mode and post the output of:

 

xfs_repair -v /dev/md1p1

 

@JorgeB thanks for your answer.

Has been running for a few hours. Should be ready tomorrow.

 

Edited January 25, 20242 yr by seyz

47 minutes ago, seyz said:

Has been running for a few hours.

That's not a good sign, but let if finish.

 

Is the old disk completely dead? See if you can get a SMART report.

24 minutes ago, JorgeB said:

That's not a good sign, but let if finish.

Ok. I'll wait.

Quote

Is the old disk completely dead? See if you can get a SMART report.

I don't know what exactly the problem with this hard drive is. I did a SMART test and found no errors. The hard drive was repeatedly deactivated and emulated by Unraid and no matter what I did (I swapped: controller, CPU, mainboard, RAM, cables; SATA from the MB didn't help either), the error messages kept coming. I kept having errors with other discs, but then they went away. However, the parity rebuild went through without any problems.
Because of the endless story, I have now decided to have the hard drive tested by the manufacturer (guarantee). At the moment the disk is no longer in the Unraid server but is hanging on another computer for testing.

See if you can mount the old disk with the UD plugin, that disk is likely the best option to get that data back.

.Sorry, could not find valid secondary superblock
Exiting now.

This probably means that nothing more can be done. Unfortunately, the old disk could neither be mounted with UD nor could attempts to repair it be convinced. However, I believe that both have the same problem and are simply not formatted. However it just comes to that.

I think I'll bite the bullet and use an unfortunately quite outdated backup. But not until I have formatted the disk ;-).

13 hours ago, seyz said:

I believe that both have the same problem and are simply not formatted.

Are you sure the disks were ever formatted? Very strange that both would not show a valid filesystem.

I am quite sure. I also have screenshots of it. And without it, I wouldn't have been able to write any data to it. The HDD was empty and new when I inserted it into the server. The fact that hard disks lose their format is not entirely unknown.

Unfortunately, the trick with the mainboard's Sata board only worked with one of two.

21 hours ago, seyz said:

The fact that hard disks lose their format is not entirely unknown.

That thread shows disk errors, those should not make a filesystem disappear.

Maybe there was this error message at the beginning with the old disk and I just overlooked it? When I had the error message with the HDD, which then ran again with a SATA port, it looked the same in the GUI. In other words, Unraid reported an unformatted disk.
But that was just a thought. I have no idea how I managed it and I'm sure you have much more experience.