I’ve been suuuuper lazy troubleshooting this so it’s been a few weeks, but I talked to WD support, they said to run a full extended S.M.A.R.T. test on the drive, it passed with no issues.

Reconnected it to my server using a different SATA cable on a different port on the motherboard, with a different power connector. It resilvered with no problems, and a zpool scrub returned no errors this time so hopefully I’m in the clear!

I have a script that runs once a week that does a scrub then sends the output of zpool status to a Discord channel. When this first started it had read errors (as mentioned in the post), then checksum errors two weeks later. With there being a couple different errors before troubleshooting, and now with no errors after a scrub I’m hoping this means everything’s fine now.

Wow that’s pretty substantial, thanks for the tips! Wow yeah Backblaze does seem pretty affordable.

Thanks, I’ll try some of those things out and see if a second scrub says the same.

That being said I have pretty good backups

Out of curiosity, what do you do for backups? The initial cost of 3x12TB drives was enough to make me not want to spend a bunch more money on backup stuff at the time, but now that I’m seeing errors I’m willing to spend a bit of money again and should look into my options.

Thanks, I will start a backup now. I don’t have any extra automated backups so I guess this is my wake-up call to figure something out.