I have a PE R720 with a PERC H710 mini card.  2 146GB drives in a raid 1.  5 300GB drives in a raid 5.  1 standby hot swap dedicated 300GB drive.  Can I just put another drive in and the array will rebuild automatically?  There are 2 racks in the front of the server and each one holds 8 drives.  So I would have to put one in the second rack.  Is that ok?  Do I need another card?  Can I do all of this with OMSA?  Looking for options.  What about this?

https://serverfault.com/questions/338179/dell-poweredge-add-new-disk-to-an-existing-raid-5-array

Will this work?