HDD Crash/Repair

we have NVR From Geovision…
set on raid6 with 20 HDD installed …
3 HDD crashed .
we did data rebuild but not able to acccess E drive afterwards…

  1. Any idea how to solve it?

  2. if we remove those 3 HDDs and recover Data into new HDDs . will it be ok to install the new HDDs backnto synology?

appreciate your help

saleh