Consulte o Perc H710 Guia do usuário , p. 18:
Reconfiguration Of Virtual Disks
An online virtual disk can be reconfigured in ways that expands its capacity and/or change its RAID level.
NOTE: Spanned virtual disks such as RAID 10, 50, and 60 cannot be reconfigured.
Pelo que entendi, o Raid 10 VD não pode ser expandido.