My client has an HP Proliant ML350G6 server. OS is on a pair of mirrored 145GB drives. Data is on a RAID 5 array of 1TB drives. The OS drives are getting really full after years of updates. These are 2.5" SAS drives. What would be the best way to get the OS on to larger drives short of a new server? Is it even possible? OS is Server 2008 R2.