So I had purchased a new large drive with my intention of upgrading my second parity drive to 18TB so that I can start slowly swapping out aging array drives with much larger ones over time.聽 聽Before I had the chance to install the new drive to get it precleared and do a parity swap, one of my drives (Disk 3) flipped to a red X and is listed as "Device is disabled, contents emulated" seemingly without any inciting event causing that.聽 聽Whether or not that disk had actually failed, I powered down to install my intended new parity disk into my server on an available SATA connection, and start the long preclear process.聽

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When I powered back on I still had the red X on that same drive, as expected.聽 I figured that while the preclear was running I'd also do a short and maybe also an extended SMART self-test on the drive to see if it was actually failed... or whether it might have just gone weird and now needed to be rebuilt upon itself.聽 I had stopped my docker containers, and checked a few other things and then spotted spontaneously that a second drive (this time Disk 5) had also flipped to a red X, with the same apparent error.聽 聽Now I'm starting to get concerned.聽 With two disk parity, I should still be okay, but now I can't suffer another disk failure without losing data.聽聽

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Both drives passed the short SMART tests, and I've got them both running extended SMART tests now... they'll be a few more hours yet.聽 And the preclear operation for the new parity drive will probably take at least a few days given its size.聽 聽聽

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Is there a way to be confident that the two drives would be okay if I try to rebuild onto both of them?聽 聽Or do I need I need to see the results of the extended SMART tests?聽聽

If they seem to test okay, should I rebuild both at the same time or do them one at a time?聽聽

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I've attached my diagnostics data.聽 I'm looking at the instructions here:聽聽https://wiki.unraid.net/Manual/Storage_Management#Replacing_failed.2Fdisabled_disk.28s.29聽 in the section "Rebuilding a drive onto itself".

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Thanks.

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tacounraid-diagnostics-20230403-0231.zip