Hi,
I'm glad I could help
From SMU guide:
https://support.hpe.com/hpesc/public/docDisplay?docId=c04220794
The system-level Vdisk Scrub option automatically checks all vdisks for disk defects. Scrub analyzes a vdisk to find and fix disk errors. It will fix parity mismatches for RAID 3, 5, 6, and 50; mirror mismatches for RAID 1 and 10; and media errors for all RAID levels
Disk group scrub does not delete any data and its just a back ground health check activity to check and fix errors.
You may abort the scrub and restart it, if its still stuck at the same percentage for several hours.