Hello.   Reconfiguration of an array does not erase any existing data; it only impacts disk performance until the reconfiguration operation is complete.   Reconfiguration operation is only performed online and even after the operation is complete, no reboot is required. Let me know whether you have any further questions about your RAID array.
Hi all, I've have a Poweredge R720 server configured with 2 Virtual Disks, one for the OS (RAID1) and one for data (RAID5 with 3 disk of 1TB each). I'm planning on expanding the raid5 with another disk. The disk has already been added and is currently recognized by the OMSA as Ready. From what I've understood now I need only to use the "reconfigure" task on the VD of the data. I've only few doubts:1- Is this "reconfigure" task going to erase all data?2- Can be performend online or I need to take down the system? Is the reboot required? Thanks for your help Paolo 
Expanding RAID5 on PowerEdge R720