Hello. It is possible to perform this operation with minimal downtime. Ensure that you have valid backup of your data just to be safe. You can do this by removing each old hard disk and replacing with 600GB disk one at a time. Allow the new disk to completely rebuild before replacing the second one. You may monitor the rebuild progress in OpenManage Server Administrator (OMSA) if installed. Clear the foreign configuration if it shows on the disks, if the disk does not rebuild and goes to READY state; assign it as a Global Hotspare. You will notice that the total capacity of the Virtual Disk (VD) will not be 600GB as there will be unused space on the disks. You will use the Online Capacity Expansion (OCE) property of your controller to claim this unused space. In OMSA, Go to Storage ->PERC H310 ->Virtual Disk -> Available Tasks -> Reconfigure -> Expand Capacity and Continue. Under RAID Level, select RAID 1 and enter 100 to reclaim all unused space on the disks and continue. See diagrammatic illustrations below: [IMAGE]   [IMAGE] Let me know whether you need any further assistance.    
I have 8 servers in my M1000e Chassis.  They all have two 146GB drives set in Raid-1.  I just came into a boat load of gently used 600GB drives out of PE R630 servers that are being re-purposed in another lab.  I would like to replace all the drives with the larger ones, with minimal downtime and Zero data loss.  Tips? Tricks? Advice?  All would be hugely appreciated before I mess up and make 400+ users very upset with me...
M610/620 PERC H310 Mini RAID 1 full disk upgrade