You can do one of two things to increase storage capacity: 1. Add additional drives in a separate RAID array.  2x1TB drives in a RAID 1, 3x500GB in a RAID 5, etc. that can be set up as a new "disk"/partition in the OS for storage. 2. Add addtitional 146GB drives to your RAID 5 - you can "reconfigure" your 4-disk RAID 5 to a 5, 6, 10-drive RAID 5 array (or up to however many open slots your 710 has).  This can be done from OpenManage Server Administrator - Storage, PERC, Virtual Disks, Reconfigure from dropdown menu for your RAID 5.  After doing this, then you can create, extend, and/or rearrange your partitions as needed.
Current setup: PERC 6/i integrated 4HDD - 146GB SAS Raid 5 setup C = about 200GB D = about 200GB   How do I increase storage capacity?  Possibly to 1TB total    Thank you
Increasing HDD capacity on T710