Fauzi79, Unfortunately with the SAS6/ir you do not have the ability to expand. You would need to backup the data, delete the array, add the drives, then reconfigure the array. After that then install the OS and restore the data. Sorry I couldn't give you the answer you were probably wanting, but it is a limitation of the controller you are using. If a Perc 6/i was installed then the process to expand is relatively simple. Let me know if this helps clarify.  
Hi, I have PowerEdge T310 with SAS 6/iR controller. I've configured it as RAID1 with 2 x 500GB HDD. Now I would like to add another 2 HDD. Is it possible to do that with current hardware & configuration? IS SAS 6/iR support for additional HDD?
Adding new HDD to current RAID1 setting on PowerEdge T310