RN104 Extremely Slow Rebuild Time.

StephenB wrote:

Read/write errors should have shown up in the smart data (in addition to power cycles if that were happening). I think you are actually meaning retries on the SATA bus, but they should be tracked in SMART as well. Should being the key word I guess. I'm not sure what would happen if the drive was simply receiving out-of-spec power, but had a solid bus connection. But I can imagine poor performance with no errors if the power were marginal.

That all sounds much more likely than what I was thinking - and actually explains what might have been happening. Thanks.

StephenB wrote:
After the rebuild completes, perhaps try powering down the NAS (from the UI), and move the green drive back to the questionable slot. Then power up. If there is no performance problem, then its probably the seating issue, and not the slot itself. If it is a bad slot, you should RMA the unit, since at some point in the future you will want to use all slots.

I didn't wait for the rebuild to finish, I powered down the NAS, moved the Green drive back to the questionable slot, then powered back up. On first glance, seems to be moving at the same rate, Still says about 8hrs to go. I'll keep an eye on it through the afternoon.