[email protected] Posted July 30, 2018 Share Posted July 30, 2018 What a mess. I have learned a lot. But still have some questions. I have been running UNRAID for about 4 years now and I run it strictly as a data storage solution, so no Plex or other app-type things installed. I have a general understanding of how the server functions and have swapped out failed drives and upgraded drives a number of times, but I do nothing outside of the GUI. I run an 8tb parity drive and 5 data drives of around 2-4tb each. Recently my parity drive began acting up. It was starting to show errors. Since all of my drives showed healthy and no errors, the first thing I did was try to rebuild parity. In retrospect, maybe not the best solution? But it would not complete a new parity rebuild. It kept getting about 30% of the way through and hanging. So I made the assumption that the parity drive was bad... and maybe that wasn't the case. Regardless, I ordered a new parity drive, popped it in and began to build parity with all 5 of my data drives functioning perfectly. And I packaged up my old parity drive to be shipped back to the vendor as it is still under warranty. I was excited to wake up and check on the parity build after day 2 of the build process only to find that one of my disks had millions of read errors and parity had not completed. I tried pulling the bad drive and swapping in a new one just to see what would happen and found that I had none of the data from the failed data drive. So I focused on trying to pull data directly from the failed/failing drive. I was able to pull quite a bit from it, although not some very important files. I estimate about 40-50% data loss. Believing I had no accurate parity drive AND a failed drive I thought I had no choice but to do a new configuration with the good data drives, build new parity, and then add in a new drive and place what files I was able to recover. So I checked the box and did a new configuration with my 4 good data drives. Parity is almost done building (which will give me a huge sense of relief). But it occurred to me that I never pulled the old parity drive (ready to go to the manufacturer for return) from the shipping box and try it in the old array before nuking that configuration. That leads to my question... is there any way I can use my 4 good data drives and the old parity drive, which may or may not be complete and may or may not work, to try to recover the contents of the failed data drive? Please let me know if I'm leaving out any need info, and thank you to anyone who takes the time to read and weigh in on this. Quote Link to comment
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