> On Jul 2, 2015, at 11:03 AM, Johan Kragsterman <johan.kragster...@capvert.se> 
> wrote:
> 
> It is only rpool, no data, but of coarse configuration data. So there are no 
> write-intensive applications writing to the drive, only log. Not even swap or 
> dump, they are on different devices.
> 
> It would be nice to know if there was a way to tell wether it is the drive or 
> the port, though...

Considering the nature of the error message, you will have to start with the 
drive. The drive, at least, can send telemetry. A physical port cannot. Make 
sure your cables are seated correctly and so on. The AHCI driver sent a command 
to power on the drive and initialize it, and it did not receive the expected 
response.

Drives (enterprise-grade or not) will fail very young (due to manufacturing 
defect) and, if they survive their first months in operation, they can go for 
years before failing. You might have a drive that fell out of the crib, or just 
a bad cable/connector. Sometimes these things take some hands-on detective work.

/dale

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