Cache Unmountable: No pool uuid | (Solved)

[nathan909]

OK so I needed to upgrade my cash drive so I created a raid 1 pool by added a SSD to mirror my nvme, after complete i pulled them off line and tried to start the pool back up with just the SSD online, but that didn't work so i pull the array offline and added the nvme, but now i get a  Unmountable: No pool uuid.

 

Haven't written to anything to either drive so both should be good with data

 

How do i get one drive or the pool back up?

 

nvme drive log:

https://pastebin.com/rgRw7VG2

 

SSD drive log
https://pastebin.com/Mn8SzXrT

 

system:

https://pastebin.com/62kj46Rb

Edited December 16, 2022 by nathan909

[JorgeB]

Please post the diagnostics.

[nathan909]

Sorry here it is

nas-diagnostics-20221215-1052.zip

[nathan909]

That was with the array off line, here it is with it online, if that makes a difference

nas-diagnostics-20221215-1055.zip

Edited December 15, 2022 by nathan909

[nathan909]

Also I meant to say it was a raid 1 Mirrored Pool (edited)

[JorgeB]

At one point you add the pool correctly mirrored, but the removed the SSD instead of removing the NVMe, then you removed thee NVMe without first adding the SSD back, hence the problem, post the output of:

 

btrfs-select-super -s 1 /dev/nvme0n1p1

 

[nathan909]

2 minutes ago, JorgeB said:

At one point you add the pool correctly mirrored, but the removed the SSD instead of removing the NVMe, then you removed thee NVMe without first adding the SSD back, hence the problem, post the output of:

 

btrfs-select-super -s 1 /dev/nvme0n1p1

 

Yes, I mistakenly started to pool with the NVMe instead of the mirrored SSD, that is when i tried to reverse it and bring up the pool with the mirrored SSD, but that is when things went south. 

 

 

root@NAS:~# btrfs-select-super -s 1 /dev/nvme0n1p1
warning, device 2 is missing
using SB copy 1, bytenr 67108864

Edited December 15, 2022 by nathan909

[JorgeB]

4 minutes ago, nathan909 said:

warning, device 2 is missing

This is not good, post the output of:

btrfs-select-super -s 1 /dev/sdg1

 

 

[JorgeB]

Then output of:

btrfs fi show

 

[JorgeB]

2 minutes ago, JorgeB said:

This is not good, post the output of:

btrfs-select-super -s 1 /dev/sdg1

Missed this one first, then the other again

[JorgeB]

3 minutes ago, JorgeB said:

Then output of:

btrfs fi show

 

[nathan909]

1 minute ago, JorgeB said:

 

root@NAS:~# btrfs-select-super -s 1 /dev/sdg1
using SB copy 1, bytenr 67108864
root@NAS:~# btrfs fi show
Label: none  uuid: 7a650073-3aaa-4476-ae27-7429a5b8c663
        Total devices 1 FS bytes used 412.00KiB
        devid    1 size 1.00GiB used 126.38MiB path /dev/loop2

Label: none  uuid: 3385c42f-7bc2-4191-ae99-8f03ddf305ab
        Total devices 2 FS bytes used 263.81GiB
        devid    1 size 465.76GiB used 430.03GiB path /dev/nvme0n1p1
        devid    2 size 476.94GiB used 430.03GiB path /dev/sdg1

[nathan909]

Thanks for your help Jorge, this is way above my head

Edited December 15, 2022 by nathan909

[JorgeB]

Now stop array, unassign both cache devices, start array, stop array, re-assign both caches devices, start array, pool should mount, if yes run a balance to raid1, only after the balance finishes remove the drive you want, if it doesn't mount post new diags, but I'm about to go offline, so likely can only continue tomorrow if no one else helps before.

 

 

 

 

[nathan909]

OK perfect, THANKS!

That did bring them both online and they are balancing

 

 

So when complete, I am going about this the right way, or is there a better way?

1. Stop Array, Shutdown PC
2. Remove NVMe
3. Install New NVMe
4. boot unraid
5. btrsf format new NVMe
6. add new NVMe to pool with SSD
7. start pool
8. balance it
9. remove SSD from pool
10. balance it again

now that I write this out there's gotta be a better way
 

[JorgeB]

If you want to replace a device (for a raid1 multi device pool only, not for single pools) you can just unassign one and assign the other, if you can't have both connected at the same time, shutdown the server, replace the device, boot Unraid, assign new device to the place of the old one, start array to begin pool balance.