ZFS i/o errors - which disk is the problem?

[Peter Schuller]

> I can believe a problematic SATA controller (it's an add-on PCI board),
> but does anyone know of a way to ask ZFS which devices in a pool it
> thinks has issues?

That is exactly what zpool status is intended to tell you. That is, the disks 
that you are seeing checksum errors on are the ones seeing the faults. In 
your case both drives show checksum errors (for some reason).

-- 
/ Peter Schuller

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