1. Yes, you can, but ONLY IF 1) your system is currently in UEFI boot mode, and 2) you are not currently using a RAID 10 (or have multiple arrays across the disks). 2. No. The PERC 6 does not support non-RAID/JBOD. RAID is ONLY risky if the USER chooses a risky RAID level (RAID 0 should only be used for specific reasons by experienced professionals). RAID 0 has NO fault tolerance.
Hello,   M using dell-r610 which is configured with PERC6/i controller, problem is i want to know when i have configured RAID-0 and remove my one of disk, server is unable to get boot, how to resolve this problem ? again, i want to know: 1. with raid configuration are we able to extend the size of disk (from 2TB to 3TB) without lossing data ? 2. are we able to use this server with no-raid because raid is going to be risky in case of any disk failure and dont want to loss data ...?       
Dell-r610 Server with PERC 6/i controller