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Solved
RN102 fails to boot when one mirrored drive fails or is missing
Hello everyboby, I have been looking for a solution or help but was not able to find any hints regarding the following problem. I own a RN102 device equiped with two disk forming a X-RAID mirror...
Well, it's still unclear to me what the root cause was. Somehow the RAID superblock that gets generated for the newly-added disk kept getting rejected because the kernel thought it was invalid. However, I don't know which part it thought was invalid, and there's no easy way to remotely debug at that low level.
Anyway, I got your box fixed up by restoring a good superblock made on another machine to your disk, and it's resyncing now and looks normal. I also made sure that volume repair worked after simulating a failure, so I don't think you'll run into this again. If you do, please let me know.
Yes, two clones of drive 2 is probably the cause. Skywalker may still want to take a look to see if he can fugure out why the FORMAT option doesn't work. But I am confident that if you simply "unformat" the second drive by removing all partitions with a PC, that it will then properly add to the array and begin the sync.
Well, it's still unclear to me what the root cause was. Somehow the RAID superblock that gets generated for the newly-added disk kept getting rejected because the kernel thought it was invalid. However, I don't know which part it thought was invalid, and there's no easy way to remotely debug at that low level.
Anyway, I got your box fixed up by restoring a good superblock made on another machine to your disk, and it's resyncing now and looks normal. I also made sure that volume repair worked after simulating a failure, so I don't think you'll run into this again. If you do, please let me know.
Hello Skywalker,
thank you very much for the help. You just made my day!
For the case that somebody else is running into such problems, here is a short summary.
1. Problem: NAS stops working when ome mirrored disk is removed.
The cause was a be root file systemen at the remaining drive after pulling disk 2. THere are thre options to repair disk. 1. A future release (currently beta) will monitir the root file system an repair it. 2. Support may recreate the root file system on at the remaining disk. 3. Replace the disk with the missing root file system an theresync will recreate it (this was my case as disk 2 only had PFA errors and was still intact).
2. Problem: Phantom volumes on disk 2 appear after replacing disk 2 (the on with the PFA errors).
This was caused by a bad superblock (may as a result of a previous clone attempt ?) . The bad superblock was fixed by support.
Thank you again for your help. I am very impressed by high effort you and Netgear are putting on end user support by the community line.
Greeting Chris
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