Hey guys i need some help with my unraid server, so the thing yesterday i noticed that my MD1 drive was throwing some ATA read errors.

and when i tried a recently added data it was throwing these errors.

BTRFS error (device md1): parent transid verify failed on 475906048 wanted 21896 found 21309

So after reseating the cable those ATA read errors are gone but this morning when i checked logs, now it showing these BTRFS errors.

Dec  1 03:40:25 Unraid kernel: BTRFS error (device md1): parent transid verify failed on 475906048 wanted 21896 found 21309
Dec  1 03:40:25 Unraid kernel: BTRFS error (device md1): parent transid verify failed on 475906048 wanted 21896 found 21309
Dec  1 03:40:25 Unraid kernel: BTRFS: error (device md1: state A) in do_free_extent_accounting:2852: errno=-5 IO failure
Dec  1 03:40:25 Unraid kernel: BTRFS: error (device md1: state EA) in btrfs_run_delayed_refs:2157: errno=-5 IO failure

Any idea what could be the cause of these errors and what can i do to fix these.

unraid.local-diagnostics-20221201-0856.zip

7 hours ago, Max said:

parent transid verify failed on 475906048 wanted 21896 found 21309

This error is fatal, it means some writes were lost and the device/controller lied about them, it's usually a device firmware or controller problem, you should backup the data and re-format the disk.

 

Also note that there's corruption detected on disk2, you should run a scrub.

On 12/1/2022 at 4:12 PM, JorgeB said:

This error is fatal, it means some writes were lost and the device/controller lied about them, it's usually a device firmware or controller problem, you should backup the data and re-format the disk.

okay will do but just now when i tried to access that data which first showed that error is now again showing this error.

ec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712
Dec  2 22:22:41 Unraid kernel: BTRFS error (device md1: state EA): parent transid verify failed on 37945344 wanted 22027 found 20712

i also tried scrubing disk 1 but it just aborts instantly on its own.

 

On 12/1/2022 at 4:12 PM, JorgeB said:

Also note that there's corruption detected on disk2, you should run a scrub.

tried this scrub didn't find any errors.

unraid.local-diagnostics-20221202-2231.zip

Also today scheduled parity check ran it found more than 42K errors.

 

Edited December 2, 20223 yr by Max

Like mentioned that error is fatal, you need to re-format, if the fs doesn't mount now you can use btrsf restore to try and recover the data, option #2 here.