February 1, 20197 yr Hi all, Only been using unraid for <30 days so far so still quite new to all of this. I've currently got 1 parity drive, 3 data drives and 1 cache. I logged into the webGUI a few days ago to see that disk 3 had been disabled with a red X next to it saying "Device is disabled, contents emulated". On the drive page it showed nothing under attributes, capabilities or identity. SMART short and extended self-tests cancelled immediately after pressing 'start', and seemingly nothing happened. Error log and self-test history were also completely blank. Seeing this I stopped the array, took the disk out of the array, restarted it, stopped it again, went to put it back and the disk wasn't even able to be assigned (just didn't appear in the list). I thought perhaps the drive had become unseated as it wasn't properly secured in a caddy, so I took it out, secured it and put it back, and it appeared in the list again able to be assigned to disk 3. I assigned it, started the array and it started parity sync/data rebuild, then shortly after failed again and disabled itself. I have some notifications about reallocated sector count which I know is not good so perhaps the drive is on it's way out, but just wanted to run it by some people here to triple check. I've uploaded a complete diagnostic log, plus two SMART reports from the affected disk (one pre-parity sync (zip ending 1703), which shows a full report, and one after the parity sync which has little info except "INQUIRY failed"? (zip ending 1758)). Please let me know if there's anything else I can supply for advice. I've already purchased a replacement drive that's on the way but it would be nice to use this extra space if I can. It also seems I can access the files that are stored on the failed/disabled disk, does this mean those particular files are there and accessible, just unprotected? Should I minimise use of these files in case it makes things worse? Apologies if these questions are silly, I'm not very familiar with unraid. Many thanks for any help! Regards tower-diagnostics-20190201-1751.zip tower-smart-20190201-1703.zip tower-smart-20190201-1758.zip
February 1, 20197 yr Community Expert Yes that disk is failing NOW as it says in the SMART. 49 minutes ago, j0shemon said: It also seems I can access the files that are stored on the failed/disabled disk, does this mean those particular files are there and accessible, just unprotected? You are accessing the emulated disk. The emulated disk is the data from the parity calculation that allows the disk to be rebuilt. Unraid will not access a disabled disk. It is instead reading parity PLUS ALL the other disks to calculate the data for the disabled disk. Not only are those files unprotected, but your entire array is since with single parity, you can only tolerate that single disabled disk.
February 2, 20197 yr Author 18 hours ago, trurl said: Yes that disk is failing NOW as it says in the SMART. You are accessing the emulated disk. The emulated disk is the data from the parity calculation that allows the disk to be rebuilt. Unraid will not access a disabled disk. It is instead reading parity PLUS ALL the other disks to calculate the data for the disabled disk. Not only are those files unprotected, but your entire array is since with single parity, you can only tolerate that single disabled disk. Thank you very much for confirming, guess I'll just keep my fingers crossed I don't have another failure before the new one arrives 😁
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