FrForget Posted April 12 Share Posted April 12 (edited) Hi 🙂,  I'm fairly new to unraid and everything seemed to be working well, until now. I decided that I wanted to migrate my cache pool to a new drive, going from 128 GB SSD to 1 TB NVME. I've seen online that a simple way to do it would be to add a new drive to the cache pool, wait for BTRFS sync to complete, stop the array, remove the 128 GB and voila, the 1 TB should now be the default drive in the cache pool.  While the first few steps worked fine, I was indeed able to add the new drive to the cache pool, BTRFS synced happened, my array was then resized to 5XX GB (with 98% usage which seems suspicious), but I was able to stop the array, so I did, removed all drive from the cache pool, changed the slots to 1, added the 1 TB as the primary drive and started the array.  It started, however I quickly saw this message next to the drive : Cache drive unmountable: Unsupported or no file system  What are my options now? I haven't erased any drives and I've been trying to set the 128 GB back, or the 1TB, but haven't been successful. I included the diagnostics too! Thanks! crousti-server-diagnostics-20240412-1144.zip Edited April 12 by FrForget Quote Link to comment
JorgeB Posted April 12 Share Posted April 12 6 minutes ago, FrForget said: removed all drive from the cache pool, changed the slots to 1, added the 1 TB as the primary drive and started the array. That won't work, to remove a device you just unassign the devices and leave the slots as they were, then start the array to begin the balance.  Stop the array, change slots to 2, start the array, if the pool doesn't mount post new diags. Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 Thank you for your answer. I just tried that and added the 1 TB back as the main cache pool drive. Unfortunately, I'm still seeing the same error : Then at the bottom, I also see this : Unmountable disk present: Cache • Samsung_SSD_980_PRO_1TB_S5P2NL0W409998F (nvme0n1) New diagnostics included too! crousti-server-diagnostics-20240412-1228.zip Quote Link to comment
JorgeB Posted April 12 Share Posted April 12 Post the output of btrfs fi show  Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 (edited) There we go :Â Seems like 2 are found, is that right? However the sizes doesn't match. Edited April 12 by FrForget Quote Link to comment
Solution JorgeB Posted April 12 Solution Share Posted April 12 Assuming that NVMe device should be the remaining one, type sfdisk /dev/nvme0n1 then type 2048 and hit enter, post the output of that Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 Here's the output : I haven't selected Yes or No. Too afraid to remove the data on the drive 🙃 Quote Link to comment
JorgeB Posted April 12 Share Posted April 12 Type 'N' and enter to keep the signature, then 'write' and enter, then output of btrfs fi show  Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 This is what I see now. Is it where I need to enter "write" ? Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 Alright, done! What's next 🙂? Going back to Main, I still see Unmountable. Do I need to Stop / Start the array? Reboot? Quote Link to comment
JorgeB Posted April 12 Share Posted April 12 16 minutes ago, JorgeB said: then output of btrfs fi show  Quote Link to comment
JorgeB Posted April 12 Share Posted April 12 Unassign the nvme device from the pool, start the array, stop the array, re-assign the device, start array, post new diags. Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 Sorry, I can't start the array until I select the "Yes, I want to do this" saying Start will remove the missing cache disk and then bring the array on-line.  That's what I want right ? Quote Link to comment
JorgeB Posted April 12 Share Posted April 12 3 minutes ago, FrForget said: That's what I want right ? Yes. Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 Well, I think we are up to something here : Interestingly it's showing 564 GB as the size? Added new diags as well. crousti-server-diagnostics-20240412-1353.zip Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 Interesting, now it says 1 TB! Now, previously, it was saying that a second drive was missing, does it now understand that only a single drive will remain in the cache? Quote Link to comment
JorgeB Posted April 12 Share Posted April 12 It's normal for the size stats to be wrong during the balance to single, just wait for the balance to finish, when ther pool activity stops, and you are done, you can then change slots to 1. Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 Looks like it is completed as I can stop the array and see the full 1 TB now.  I want to say a HUGE thank you for the instructions you've provided.  Overall, would you say that this is the proper way to do it? If I wouldn't have change the slots number to 1 and simply unassigned the second drive and wait for it to balance, I wouldn't have had to use the command line do fix the drive right? Quote Link to comment
JorgeB Posted April 12 Share Posted April 12 5 minutes ago, FrForget said: Overall, would you say that this is the proper way to do it? If I wouldn't have change the slots number to 1 and simply unassigned the second drive and wait for it to balance, I wouldn't have had to use the command line do fix the drive right? Correct. Quote Link to comment
FrForget Posted April 12 Author Share Posted April 12 Again, thank you so much! The information you've provided here are really useful. 1 Quote Link to comment
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