PowerEdge T105 only support 2 HDD hence there will not be a cable to connect more than 2 drives to SAS 6/iR. You can try with another cable but we can not guarantee that it will work as it is not a supported configuration hence not validated. You may face issues with power cable for more than two drives on T105.
Hi  The sas6/ir is working in my T105. I've read this controller will only accept drives up to 2TB so I have SAS0 with 2x2tb drives. Is there any reason why I can't get a second drop cable for SAS1 and put another 2x2TB drives onto that. Would just need a caddy in the under the Optical I think.  I am just using Raid 0 so don't need to do anything clever. Thanks Graham    
How many drives will a sas6/ir support?