Kevin wrote:
> We'll try running all of the diagnostic tests to rule out any other issues.

Does the server have ECC memory?  Many x86 systems do not :-(

> But my question is, wouldn't I need to see at least 3 checksum errors on the 
> individual devices in order for there to be a visible error in the top level 
> vdev? There doesn't appear to be enough raw checksum errors on the disks for 
> there to have been 3 errors in the same vdev block. Or am I not understanding 
> the checksum count correctly?

You are assuming the corruption occured at the disk.  That does not seem
to be the case.  ZFS checksums provide end-to-end data integrity.  It will
detect hard or transient errors along the entire data path.
  -- richard
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