G-Raid with Thunderbolt and MiniDisplayPort daisy chain


#1

I have a Mac mini Server 2011 with a single thunderbolt port. It is connected to a G-Raid with Thunderbolt (no USB). The second Thunderbolt port on the G-Raid has a miniDisplayPort cable to a mid 2010 iMac that supports Target display mode. When I activate the TDM screen sometimes there is interference on the iMac display. The interference is intermittent. Sometimes none, sometimes a lot. It doesn’t seem to have anything to do with disk access on the G-raid. It even occurs with the G-raid powered off. I tried using another Mac as the source and the problem still occurs so it isn’t the Mac mini Server. I tried a new apple thunderbolt cable and the problem occurs. If I cable directly from the Mac mini server to the iMac, no interference.
So it is the G-raid device’s thunderbolt ports daisy chained that seems to be the problem. I tried swapping the order of the cables, no difference, it still has interference. Anyone have any ideas or suggestions?


#2

It could be due to the age of the device or the computer not being able to handle a clean transfer via daisy chain. If you had another device to try the chain > display with as well you could see if that is true or if it just an issue with the G-RAIDs backplane only.

If it is under warranty you could get a replacement unit. Warranty and RMA creation


#3

Thanks for the response. I did use a newer iMac as the video source ( instead of the older Mac mini server) and had the same problem. So that is why I believe it is the G-raid, generating interference. I don’t have another mini display port capable display to check, but since there is no interference with the non daisy chain connection I don’t think it is the iMac being used as the display.

It is an old device well past warranty, but I was hoping someone else had seen the problem and might have some solution I hadn’t thought of yet.