October 10, 20187 yr I have 1 parity drive and 3 data drives all 2 TB. All at once the Parity drive was marked as faulty and the 3rd data drive seems to have failed. The parity drive is still functional and passes all of the smart tests but unraid will not try and use it for the rebuild. I would appreciate any help thank you. their-server-diagnostics-20181010-1155.zip
October 10, 20187 yr Author Should I use the Trust my parity to get the parity drive back and rebuild the Disk3?
October 10, 20187 yr Community Expert Power down, check connection on disk3, power back up and post new diags.
October 10, 20187 yr Author Ok rebooted parity still seams to be ok and passing smart tests but disk 3 is still not showing up in bios or unraid their-server-syslog-20181010-1258.zip their-server-diagnostics-20181010-1300.zip
October 10, 20187 yr Community Expert Then you have a problem since there are two invalid disks with just single parity, you can force parity to be valid, but it needs to still be in sync to rebuild disk3 without corrupt data, and since 1st diags are after rebooting we can't see what happened, and you need a spare disk same size of original disk3, if you think parity is valid and have a spare disk and want to try it I can post the instructions.
October 10, 20187 yr Author Unless there is any other solution I think I should try and rebuild. I do have more 2Tb drives to use to replace disk3 if it ends up not working am i any wore off? What if i try and recover what data is on the drives that still work and start over. I know that Disk3 only had about 20gb on it and if i loose some thats ok I would just like to not loose it all.
October 10, 20187 yr Community Expert If disk3 is really dead there's not much else you can do, and nothing to lose really, except time, do this: -Tools -> New Config -> Retain current configuration: All -> Apply -Assign any missing disk(s), including new disk3 -Important - After checking the assignments leave the browser on that page, the "Main" page. -Open an SSH session/use the console and type: mdcmd set invalidslot 3 29 -Back on the GUI and without refreshing the page, just start the array, do not check the "parity is already valid" box, disk3 will start rebuilding, if parity is valid disk should mount immediately but if it's unmountable don't format, wait for the rebuild to finish and then run a filesystem check
October 10, 20187 yr Author Thank you so much before I try it can you give me a simple explanation of what that command does I just want to understand what is happening.
October 10, 20187 yr Community Expert Normally after a new config all disks are valid except parity(s), the command sets disk3 (and disk29 which is parity2 since you don't have one) as the only invalid disks, parity is then considered valid, so at array start it will begin rebuilding disk3.
October 10, 20187 yr Author Well things seem to be going ok I followed what you said and it just mounted the parity and started to rebuild disk3. I have definitely learned my lesson, as soon as its back to normal I am going to add another 2tb parity drive. thank you so much ill post back once its finished rebuilding
October 10, 20187 yr Author I believe it is mounted and rebuilding it was precleared and sitting on a shelf waiting to go in if something happened its the Hitachi
October 11, 20187 yr Author Thank you so much for your help, Everything seems to be back to normal operation is there anything i should look out for? Or is everything fixed? It ran a Parity sync and data rebuild should i run a scan to check the data again? Again thank you
October 11, 20187 yr Community Expert Disk mounting is a good sign but run a file system check and spot check some files to see if all looks good.
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