Hello, i suggest to perform operation directly on PERC controller. You can see this video that show you how to do it (the video is from RAID1 to RAID 6) but the steps are the same. Video [URL]   more information [URL]   Thanks Marco
Hi, I have a PowerEdge R815 with 6 1TB SSD in a RAID5 with a PERC H700 supporting a ESXI 6.5 OS. I want to increase the capacity and reliability by swapping the 1TB SSDs with 6 4TB SSD in a RAID6 without loosing data and with minimal downtime.  Is it possible to do an in-place migration from RAID-5 to RAID-6 without disturbing data? 
PowerEdge R815 6 1TB SSD in a RAID5 with a PERC H700 to 6 4TB SSD in a RAID6 
without loosing data with minimal downtime.