December 14, 20178 yr I just had a power failure. Unfortunately, I don't have a UPS. Disk 4 is now disabled with errors. Here are the diagnostics. What is my course of action from here? Last time I had to replace a disk things got royally screwed up and I lost my data. Edited December 14, 20178 yr by Living Legend
December 14, 20178 yr Community Expert Disk4 dropped offline so there's no SMART report, power down, check cables, power up and post new diags. You can already check the data that is going to be on the rebuilt disk, no matter if you rebuild to a new disks or use the old one, just check the emulated disk4, data currently there is the same that will be when the rebuild is finished.
December 14, 20178 yr Author 2 minutes ago, johnnie.black said: Disk4 dropped offline so there's no SMART report, power down, check cables, power up and post new diags. You can already check the data that is going to be on the rebuilt disk, no matter if you rebuild to a new disks or use the old one, just check the emulated disk4, data currently there is the same that will be when the rebuild is finished. I thought there was a difference between rebuilding the physical disk vs using the old one. Won't I lose any writes since the disk failed if I don't completely rebuild the disk?
December 14, 20178 yr Community Expert I meant rebuilt to a new disk (if the old failed) or rebuild to the old disk.
December 14, 20178 yr Author 7 minutes ago, johnnie.black said: I meant rebuilt to a new disk (if the old failed) or rebuild to the old disk. New diagnostics. unraid-diagnostics-20171214-1449.zip
December 14, 20178 yr Community Expert SMART looks fine, you can rebuild to to old disk, but before that don't forget to check that the data looks OK on the emulated disk. Also, disk4 didn't become disable directly because of a power failure, it was disable during the parity check initiated after the unclean shutdown, i.e., it would most likely be disabled in the next check or before that even without a power failure, disks don't get disable for no reason, since SMART looks fine most likely a cable/connection issue but healthy SMART does not always equal healthy disk, what I usually do is swap cables with another disk and if the same disk fails again in the near future it's probably bad.
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