I’ve got the same situation over here; just purchased 2 x 4TB WD Red WD40EFAX and I’m trying to use them with ZFS in Linux (zfs 0.8.3 and kernel 4.17.14), on a HP Gen8 Microserver.
The SMART info looks clean, except for the IDNF errors in the extended log. They show up during ZFS resilvering. Ran a complete badblocks test, as well as the short / long SMART tests and no further errors occured.
My complete SMART output + kernel errors: pastebin log.
I will move them to a windows machine and use WD’s test tool on them, but until then I’m doing a couple more tests with a new ZFS pool, to see if I can reproduce the problem. I also plan on testing btrfs (although i don’t think this looks like a software - zfs - issue)
