> I could solve the problem by ncq blacklisting the "Maxtor 6V300F0" devices
> in libata-core.c

That's a strange story.  The reported error was PHY readiness changed
and Device exchanged, both of which point to hotplug event.  Maybe
something causes the firmware to reset?  What happen if you only leave
two drives on the port multiplier and remove the NCQ blacklist?  Also,
does the error ever occur on the drives which are connected directly to
the controller?

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