root@Raptor:/mnt/disks/usb_backup/restore# btrfs restore -v /dev/sdf1 /mnt/disks/usb_backup/restore
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
root@Raptor:/mnt/disks/usb_backup/restore#

 

root@Raptor:/mnt/disks/usb_backup/restore# btrfs restore -v /dev/md3 /mnt/disks/usb_backup/restore
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
root@Raptor:/mnt/disks/usb_backup/restore#

 

 

 

------

 

 

root@Raptor:/mnt/disks/usb_backup/restore# btrfs restore -vi /dev/md3 /mnt/disks/usb_backup/restore
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
parent transid verify failed on 163840 wanted 24781 found 10491
parent transid verify failed on 163840 wanted 24781 found 10491
Ignoring transid failure
Couldn't map the block 746897408
Invalid mapping for 746897408-746913792, got 1663247056896-1664320880640
Couldn't map the block 746897408
bytenr mismatch, want=746897408, have=0
Couldn't read tree root
Could not open root, trying backup super
root@Raptor:/mnt/disks/usb_backup/restore#

@johnnie.black

 

No luck at all here 🤔

Doesn't look good, looks like the superblock is also damaged, can't help more, you can try the btrfs mailing list to see if the maintainers can help you more.

Just now, johnnie.black said:

Doesn't look good, looks like the superblock is also damaged, can't help more, you can try the btrfs mailing list to see if the maintainers can help you more.

Ok, I'll try that

 

------

 

I don't understand why the storage isn't being emulated in the way I've seen it before though?

 

The parity should be able to calculate the missing 1's & 0's and 'reconstruct' the data missing from disk3, no?

I should have the ability to see the emulated contents of the disk despite the disk being borked?

 

I'm really lost here  

10 minutes ago, nexusmaniac said:

The parity should be able to calculate the missing 1's & 0's and 'reconstruct' the data missing from disk3, no?

I should have the ability to see the emulated contents of the disk despite the disk being borked?

The problem was because like I explained earlier, you mounted the disks read/write without parity, that was enough to make it a little out of sync, and with btrfs this is especially bad, since the transaction generations won't match, this woudn't happened if you had mounted them read only.

I really have screwed myself here 😭😖

 

So my next thought.

 

If I format sdf,disk3 so that it's readable. And do the parity restore again (3rd times the charm 🙈) I should be able to access my disk and then see my data?? 😅

Some of it at least (perhaps)

25 minutes ago, nexusmaniac said:

If I format sdf,disk3 so that it's readable. And do the parity restore again (3rd times the charm 🙈) I should be able to access my disk and then see my data??

No, it won't help, if you format outside the array and restore one more time it will be exactly as is now, the rebuild formats the disk, no difference in formatting before doing it.