Capacity Expansion on PERCH700 RAID-10

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http://serverfault.com – I have Dell Poweredge R710 server with PERC H700 Integrated RAID controller. Currently there are 4 SAS 300GB disks in RAID-10 array exposing single volume of 600GB. Server is running VMware ESXi 5.1. I have 4 new SAS 300GB disks that I would like to add to this server to gain ~ 1.2 TB RAID-10 volume. I wonder if I can do this expansion without loosing data on existing disks? Ideally I would like to perform this online, but offline upgrade is acceptable as well. Technical Guide seems to indicate (it's bit unclear) that it's not possible to expand RAID-10 array. Can anyone give me a hints wh (HowTos)