Synology BTRFS repair

Repair synology BTRFS volume

btrfs fi show -d
(/dev/mapper/vg1000-lv)

syno_poweroff_task -d

(or: umount /volume1)
(or2: umount /volume1 -f -k)

Check to see if all us unmounted:
df -h

mdadm --stop /dev/vg1000/lv

btrfsck /dev/vg1000/lv

btrfs check --repair /dev/vg1000/lv

btrfs rescue super-recover -v /dev/vg1000/lv

vgchange -ay

e2fsck -nvf -C 0 /dev/vg1000/lv

fsck.ext4 -pvf -C 0 /dev/vg1000/lv

(or: e2fsck -pvf -C 0 /dev/vg1000/lv -C O)
(do not do this: -C fd)

Hy Delete the 2 files of Metadata in the plex directory and try again . It should work 👍.  When its finished update the Plex Library.

Jeez, replying to my message via email, made your response pretty bad to read in the thread. Please read and reply in gist instead. Doing from the mail, does not work properly.
Coming back to your response, I think you haven’t read my post properly. See what I wrote:

Then I removed the 2 files that were corrupted (I don't care about them), just in case it was aborting the scrubbing because of them, as a kind reddit user told me it could be the case.

As you can see, I already did and didn’t work as when I repeated the scrubbing it failed the same way…

@eduarcor do you have snapshots enabled on those two files? Might be that the snapshots are interfering?

I don’t have any snapshot. I am not using snapshots

Tried again:

> btrfs scrub status -d /volume1
scrub status for 98dcebd8-a24e-4d16-b7d1-90917471e437
scrub device /dev/mapper/cachedev_0 (id 1) history
scrub started at Tue Jun 10 23:36:50 2025 and was aborted after 03:57:18
total bytes scrubbed: 13.32TiB with 1 errors
error details: csum=1
corrected errors: 0, uncorrectable errors: 1, unverified errors: 0

> btrfs scrub status -d -R /volume1
scrub status for 98dcebd8-a24e-4d16-b7d1-90917471e437
scrub device /dev/mapper/cachedev_0 (id 1) history
scrub started at Tue Jun 10 23:36:50 2025 and was aborted after 03:57:18
data_extents_scrubbed: 223444115
tree_extents_scrubbed: 3395356
data_bytes_scrubbed: 14590691647488
tree_bytes_scrubbed: 55629512704
read_errors: 0
csum_errors: 1
verify_errors: 0
no_csum: 2450
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 1
unverified_errors: 0
corrected_errors: 0
last_physical: 15662894481408

And again,

> btrfs scrub status -d /volume1
scrub status for 98dcebd8-a24e-4d16-b7d1-90917471e437
scrub device /dev/mapper/cachedev_0 (id 1) history
scrub started at Wed Jun 11 03:56:46 2025 and was aborted after 03:40:22
total bytes scrubbed: 13.32TiB with 1 errors
error details: csum=1
corrected errors: 0, uncorrectable errors: 1, unverified errors: 0

> btrfs scrub status -d -R /volume1
scrub status for 98dcebd8-a24e-4d16-b7d1-90917471e437
scrub device /dev/mapper/cachedev_0 (id 1) history
scrub started at Wed Jun 11 03:56:46 2025 and was aborted after 03:40:22
data_extents_scrubbed: 223443880
tree_extents_scrubbed: 3395228
data_bytes_scrubbed: 14590688092160
tree_bytes_scrubbed: 55627415552
read_errors: 0
csum_errors: 1
verify_errors: 0
no_csum: 2450
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 1
unverified_errors: 0
corrected_errors: 0
last_physical: 15662894481408

Sadly, same thing. No logs in the log center. No info. No help. Nothing.