Tried replacing CACHE Drive, now nothing is there

[NAStyKappeli]

Hi 

 

I followed this post on how to replace the CACHE Pool Drive with a new one.

 

 

I am able to plug in both the old and the new. So what i did was i stopped the Array, selected the new drive (So that the new one appears in "Cache" and the old one goes to "unassigned". Then i started the Array. 

 

However, nothing happened except all my docker and stuff was gone. 

 

Then i thought maybe setting things as they were helps, but no. Now it says that the disk has nothing on it (the old and the new one). 

 

What did i do wrong? How do i get my Data back? 

 

Im still learning UNRAID, so any help is much appreciated. 

 

Best Regards

[JorgeB]

13 hours ago, NAStyKappeli said:

I followed this post on how to replace the CACHE Pool Drive with a new one.

Do you mean you followed the part for a directly device replacement that has a line across it and mentions it does no longer works or was this a multi device pool? If the latter please post the diagnostics.

 

 

[NAStyKappeli]

1 hour ago, JorgeB said:

Do you mean you followed the part for a directly device replacement that has a line across it and mentions it does no longer works

Wait noo, that is exactly what i did. Welp. Nothing i can do i guess? 

 

I somehow thought "-You can't directly replace an existing device with a smaller one, only one of the same or larger size, you can add one or more smaller devices to a pool and after it's done balancing stop the array and remove the larger device(s) (one at a time if more than one), obviously only possible if data still fits on the resulting smaller pool." applies to replacements as well..

[JorgeB]

50 minutes ago, NAStyKappeli said:

you can add one or more smaller devices to a pool and after it's done balancing stop the array and remove the larger device(s) (one at a time if more than one), obviously only possible if data still fits on the resulting smaller pool." applies to replacements as well..

This works but it's not a direct replacement, first add one device and only after that's done can you remove the old one.

 

There's a good change your old cache is still recoverable if nothing else was done, please post the diagnostics.

[NAStyKappeli]

13 minutes ago, JorgeB said:

There's a good change your old cache is still recoverable if nothing else was done, please post the diagnostics.

Thanks for the quick reply.nasty-diagnostics-20221211-1431.zip Diagnostics are attached

[JorgeB]

Post the output of:

btrfs-select-super -s 1 /dev/sdb1

 

[NAStyKappeli]

using SB copy 1, bytenr 67108864

[JorgeB]

Now stop the array, unassign the new cache device, start array (without any device assigned as cache), stop array, assign old cache device, start array, old cache fs should be back.

[NAStyKappeli]

Unfortunately, still same error: 

It also says that the Samsung SSD is Unmountable: 

[JorgeB]

That's not the old cache device.

[NAStyKappeli]

It is, the new one is this one: 

 

I had an "old" Samsung SSD lying around which i used for Cache. Now i want to replace it with a WD Red SATA and an Intenso NVMe. Since i only have one NVME Slot, i wanted to first move everything over to the SATA Drive, then remove the Samsung NVMe and install the new Intenso NVMe. 

 

Why do you think that the Samsung Drive is not the old one? Do the Diagnostics say so? 

[JorgeB]

Ahh, OK, diags showed the other device being wiped, so I assumed that was the original cache, maybe you rebooted after the initial swap?

 

Then post the output of:

 

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

 

[NAStyKappeli]

Ohh ok, yes i did reboot the Server multiple times in the meantime.

 

What i did after the initial swap and seeing that nothing happens is i stopped the array and moved everything back as it was (WD Drive "unassigned" and Samsung Drive back to the Cache Pool). When i then started the Array i saw the "unmountable" error for the first time and rebooted the server. 

 

Output is: using SB copy 1, bytenr 67108864

[JorgeB]

Assuming the NMVe device is still assigned just start (or re-start) the array.

[NAStyKappeli]

OH MY GODDD YESSS!!!! It looks like its all back again!

 

So, that i don't fck it up again, this is the right procedure for me right? (The "How do I replace/upgrade my single cache device? (unRAID v6.2 and above only" post)

 

[JorgeB]

That will work, you can also add the new device to the pool and only after that is complete remove the old one from the pool.

[NAStyKappeli]

On 12/11/2022 at 3:29 PM, JorgeB said:

you can also add the new device to the pool and only after that is complete remove the old one from the pool.

Hi again

 

Yesterday my drive went missing again, there is something wrong with the samsung one. So today i tried it again. You say "after that is complete", when do i know if its complete? 

Currently, the WDC drive is still a "new device". That has to go green right? Then, i can remove the Old Samsung drive and im good? 

 

Thanks again!

[JorgeB]

There won't be any device activity, or at least constant activity, also you won't be able to stop the array until it's done, the icon will remain blue for the first time, kind of a bug, if you post new diags to confirm all is well.

[NAStyKappeli]

The Stop Array button is available. New Diags attached. nasty-diagnostics-20221212-1919.zip

[JorgeB]

Diags appear to have been grabbed just before it finished the balance, post new ones please.

[NAStyKappeli]

New diags attached, devinasty-diagnostics-20221212-1947.zipce still blue

[JorgeB]

Yes, the icon won't change but the balance finished, you can now just stop array, remove the old cache device and start array, a new balance will begin to delete the device removed from the pool.

[NAStyKappeli]

Hi, everything is up and seems to be working. Thank you so very much for the help and patience, i really appreciate it!

Is there a way i can buy you a coffee or something? 

 

Best Regards!

[JorgeB]

Great, you can use paypal.me/blackjohnnie

Thanks.