What happens if you disable NCQ? Seen similar crap on another system with WD drives, and I suspect a firmware bug.
That system was OK with a queue depth of 2 or less. You can confirm this with hdparm -t, I think. This problem should really be assigned to the kernel I suppose, as all that mdadm does is to tell the kernel to execute the check.... Ta, Tim. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]

