Upgrade DL180 G6 RAID HDD's

[Benslade]

I currently have a DL180 G6 server with 2 x SAS (OS) drives, 6 x 1TB SATA (data) drives (RAID5) and an P410 smart array.

I'd like to upgrade the storage partition by replacing the 1TB drives with 2TB's. This server's off-site and the ACU was uninstalled from the (Windows 2008 R2) so I can interogate it remotely.

How do I go about replacing the HDD's and rebuild the RAID? Hopefully I can keep the OS partition and just delete current data partition, replace drives and rebuild RAID5 partition?

Cheers

Ben