Hello,  I would recommend to open up case with support it might be a hardware issue. Also you need to check drive firmware patch installed.  Thanks
Hello, we have perform the upgrade to version 7.1.1.1 and applied the following SMB roll-up patch (138747).  Prior to the upgrade we didn't have any problem to access the shares, but after the upgrade we receive the following message :  "a device attach to the system is not functioning".  any idea or suggestions?  Thanks Daniel
Isilon 7.1.1.1 - after the upgrade to this version we get the following message 
"a device attach to the system is not functioning"