Yes, it will be erased.  You cannot convert to OR from a nested RAID level (10/50/60), so if you want to move to a RAID 10, you will need to do a full backup/restore.
hi, Dell PowerEdge  410 / Physical Disks on Controller PERC H700 Adapter Currently my server is running RaiD 1, I have one Virtual disk and two physical HDD. so, two SAS  hard drives is configured as Raid1. I need to expand  the disk space and add additional two hard drives in same space on this virtual disk, Can I just add these drives to the virtual drive RAID1 without losing data and expand it? if so, how does it work?
Dell PowerEdge 410 / PERC H700 Adapter / Can I just add these drives to the 
virtual drive RAID1 without losing data?