February 22, 20197 yr So apparently I’ve managed to fry two of my hard-drives and I was hoping for some advise on the safest / easiest way to get everything back up and running. A little bit of background – I was trying to upgrade to a new server (whilst keeping the current Unraid array) and things went horribly wrong: Ran full Parity check – PASSED Backup of array (IMPORTANT!) Moved drives from old server to new server. Test boot Unraid from USB stick with no drives connected. Run MemTest - PASSED Memory & CPU all detected and no errors. Plugged in hard-drives and switched on. At this point the case fans spun-up for less than a second, before stopping and a red warning light appeared on the PSU. Further investigation & testing revealed that the culprit appears to be a ‘Molex to Sata Power splitter’. The 2 drives it connected no longer spin-up and aren’t detected by the OS. I’ve tried all the drives in the old server – the 2 on the molex splitter aren’t detected, but the other 2 seem fine. The good news is I have full backups (minus a few easily replaceable items). The bad news is that I obviously can’t restore from parity as I only have one parity drive – so repairing this is going to take a while…. I just don’t know what’s possible and how to minimise any chance of errors (at this point the backups are the only copy!) The backups aren’t 100% complete and are scattered over multiple smaller drives – so no matter what I do, I’m going to need to rebuild parity at some point. Current Drives: - PARITY - Working. Parity - DISK A - Working - DISK B – Not Spinning up - DISK C - Not Spinning up I’ve got replacement disks for B & C. Before I do anything else, I’m going to pre-clear these (running on the new server). This will stress-test both the drives and the new hardware - if it’s going to fail again, I’d prefer it to do so on empty disks! Its been a while since I’ve done it, but if the drives are pre-cleared I can just add them to an array without needing to rebuild parity? Rebuild Process: - Create new array with just the working PARITY & DISK A. - As the new drives pass pre-clear, add them as empty drives to the array. - Restore backups directly to the array. Is it possible to rebuild the array with just the existing disk A without losing data (from disk A)? Since Unraid already recognised these drives, can I just tell it to forget drives B & C & then rebuild parity? Would this work? Or are there potential issues I haven’t thought of yet? Is it possible my drives aren’t actually dead? (I’m clutching at straws– but I’m not a hardware expert so its possible I’ve missed something). Any advise will be gratefully received!
February 22, 20197 yr Community Expert 20 minutes ago, mp285 said: Is it possible to rebuild the array with just the existing disk A without losing data (from disk A)? Since Unraid already recognised these drives, can I just tell it to forget drives B & C & then rebuild parity? Yes, tools -> new config Just make sure old disk1 is assigned to a data slot.
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