August 25, 20187 yr Will I get the option "yes, I want to do this?" Meaning, move data back to the disk. This is of course subject to the failed drive being able to be revived, if not, I will replace the drive. No idea why drive became faulty.
August 25, 20187 yr Community Expert It is worth noting that a red ‘x’ does not necessarily mean a drive is faulty - just to a write to it has failed so unRAID has stopped using it. External factors (e.g. cabling) are a far more common occurrence than the drive itself failing. You do not HAVE to preclear it first if you want to try re-using it (although you might want to do the preclear as a drive confidence check). Simply stopping the array; unassigning the disk; restarting the array will make unRAID ‘forget’ the drive was part of the array. The next time you stop the array and assign the disk again then unRAID will inform you that it will be rebuilt if you proceed. The rebuild process rewrites every sector of the drive which is why a preclear is optional rather than being required.
August 25, 20187 yr Author So if I want to try it out again, better turn off the PC, check or replace sata cables, and start it back up? Check rebuild? Don't want to give up on the drive just yet. Edited August 25, 20187 yr by jang430
August 25, 20187 yr 1 hour ago, jang430 said: So if I want to try it out again, better turn off the PC, check or replace sata cables, and start it back up? Check rebuild? Don't want to give up on the drive just yet. Shut down and check/replace the cables. Power up and check the SMART report for the disk. It's a good idea to run the extended self test before re-using the disk. If it fails then replace it. If it passes then rebuild onto the same disk. To do that stop the array, unassign the disk, start the array, stop the array, reassign the disk, finally start the array again and the rebuild will start automatically.
August 26, 20187 yr 11 minutes ago, jang430 said: Where do I see this? Here? The SMART status is shown in the Attributes section. If you don't know how to interpret it then download the SMART report and post it or, better, post your diagnostics zip, which includes SMART reports for all disks and a wealth of other useful information about the health of your server. Tools -> Diagnostics. 12 minutes ago, jang430 said: Also, the extended test is to be run here? Yes, click the Start button next to SMART extended self-test.
August 26, 20187 yr Community Expert 23 hours ago, jang430 said: Will I get the option "yes, I want to do this?" Meaning, move data back to the disk. This is of course subject to the failed drive being able to be revived, if not, I will replace the drive. No idea why drive became faulty. I highlighted one part of your post because it seems confused about how things work. There will be no moving of data back to the disk because the data isn't on another disk to move it from. The data is being emulated by using the parity calculation to calculate it from all the other disks. When you rebuild the disk, that emulated data will be written to it. I don't necessarily disagree with the advice to do a SMART test, but I would just note that unless you have dual parity your array is unprotected and will be so until you rebuild the disk, which is likely to be several hours with an extended SMART test. Avoid writing to your server until it is protected again.
August 27, 20187 yr Author @trurl, thanks for the clarification. I've attached my preliminary smart diagnostic report. I've since replaced the cable, and did an extensive test, that isn't finished yet. smart-20180826-2147.zip
August 27, 20187 yr Author The results of the extended test came back. It shows completed without errors. Do I need to download the report? Where can I find it?
August 27, 20187 yr Community Expert 3 minutes ago, jang430 said: The results of the extended test came back. It shows completed without errors. Do I need to download the report? Where can I find it? The Download button is on the same page where you started the test.
August 27, 20187 yr Community Expert 1 minute ago, jang430 said: so stop array, assign it to orig slot, start array, rebuild? yes
August 27, 20187 yr Author stopped array, saw the drive is already re-assigned in disk1, started the array, and I still see a red X on it, says device is disabled, device emulated. Anything I should tick? Shall I start parity check? Edited August 27, 20187 yr by jang430
August 27, 20187 yr Community Expert Did you ever have the array started with the disk unassigned? Stop array, unassign disk, start array with disk unassigned, stop array, reassign disk, start array to rebuild.
August 28, 20187 yr Author after rebuild, still got the same red X on the drive. I'm attaching the report. smart-20180828-1755.zip
August 28, 20187 yr Community Expert SMART looks fine. SInce you didn't post the complete diagnostics zip I can only guess a controller, cable, or connection problem.
August 29, 20187 yr Author @trurl, HDD connected directly to M/B. I already replaced Sata cable with new one before perform extended diagnostic test. The zip I attached came from this button. I thought it's the complete one. Where do I find the complete report?
August 29, 20187 yr Community Expert The diagnostics from your old version of unRAID require a lot more work from us and don't give us as much information. Please upgrade after you get your array square. Looks like disk1 disconnected during rebuild, but SMART OK. Shut down, check all connections, power and SATA, both ends. Don't bundle SATA cables, you can get crosstalk. Each connector must sit squarely on the connections without any strain that would cause it to work loose.
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