Disk shows an "Unmountable: Wrong or no file system" - not being emulated

[Husker_N7242C]

Hi guys,

I recently added a new parity disk, rebuilt parity ok then a couple of days later I had an issue with a power cable which caused read errors on multiple disks. I shut down the server prior to any disks being disabled and I replaced the bad cable. After replacing the cable and rebooting disk4 is unmountable.

Parity should be valid, but contents of disk aren't being emulated. I don't understand why. 

 

I tried running xfs_repair -n /dev/sdp twice but the disk hasn't come good.

 

Is there a way to emulate the disk so that i can copy the data to other disks and try re-formatting the unmountable disk?

 

 Attached is a screenshot of the GUI and diagnostics. 

 

Thanks in advance

nas-diagnostics-20231102-1954.zip

[JorgeB]

1 hour ago, Husker_N7242C said:

I tried running xfs_repair -n /dev/sdp twice but the disk hasn't come good.

Using /dev/sdX won't work, use the GUI, see check filesystem, and run it without -n or nothing will be done.

[Husker_N7242C]

Thanks so much for your help @JorgeB. It is up and running again with only 2 files in lost and found, most data looks intact. 

Are you able to shed any light on why the parity didn't emulate the disk contents in this instance?

[JorgeB]

It's not that uncommon for a disk that had read/writes errors or got disabled to need a filesystem check, probably some lost writes.