November 18, 20241 yr I'm hoping for some assistance after searching the forums for a similar situation. I've migrated my drives and Unraid install from a JBOD enclosure/Micro PC to a new system with the drive attached directly to the motherboard. It appears the JBOD encloser did not pass the serial numbers to Unraid. How to I reassign the drives to the correct position without losing data? I have not started the array. Photos
November 18, 20241 yr Community Expert New Config. Make very certain you don't assign any data disk to any parity slot
November 18, 20241 yr Community Expert Since you only got one parity. the order doesnt really matter, luckily. You need to check which of the drives have an actual file system, those are your data drives and the one without a filesystem, thats your parity.
November 18, 20241 yr Author Thank you for the reply. How can I check what drive has a file system and what one does not?
November 18, 20241 yr Community Expert The Unassigned Devices plugin should list you the drives with their respective filesystem on the main page
November 18, 20241 yr Community Expert If you mount any disks you will have to rebuild parity. If you are absolutely certain you know which disk is parity you don't need to worry about the rest and we can go from there.
November 18, 20241 yr Community Expert Something not right somewhere. Parity absolutely does not have a filesystem.
November 18, 20241 yr Community Expert 2 minutes ago, Awwslam said: It looks like they all have file systems. Mhmm You could check the smart data to see which disk has the highest amount of data written, if the parity drive has been in use for the same amount of time. 3 minutes ago, trurl said: If you mount any disks you will have to rebuild parity. If you are absolutely certain you know which disk is parity you don't need to worry about the rest and we can go from there. Are you sure, with the read only flag?
November 18, 20241 yr Community Expert 1 minute ago, Mainfrezzer said: Are you sure, with the read only flag? Read only would work. Don't see how all the HDDs are showing up as xfs in UD though. OP Are you sure you have all the same disks as before?
November 18, 20241 yr Author 100% sure. I removed my only 4 disks from the JBOD enclosure, installed in the new tower, booted up and here we are. I'm really at a loss and do not want to lose my data if possible.
November 18, 20241 yr Author I booted to unraid without doing anything else to this point. I didn't mount or format any disks in unassigned devices. Unless I inadvertently did, but I was careful not to do anything once I realized the IDs were not the same.
November 18, 20241 yr Community Expert https://docs.unraid.net/unraid-os/manual/changing-the-flash-device/#what-to-do-if-you-have-no-backup-and-do-not-know-your-disk-assignments
November 18, 20241 yr Community Expert With an odd number of data devices, parity may appear to have a valid filesystem, but it shouldn't mount.
November 18, 20241 yr Community Expert Forget that link. No need to start with a fresh install. See if you can mount each of the HDDs readonly in UD and see what is on them.
November 18, 20241 yr Author Thanks! 3 mounted and one failed. So I should be able to assign the failed to mount disk as parity and the other 3 in any array disk spot, correct? I appreciate the help!
November 18, 20241 yr Community Expert Solution Correct, check parity is already valid, but run a correcting check.
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