These "Advanced Data Guarding" (ADG) levels provide higher fault tolerance by allowing for two simultaneous drive failures.
It is important to note that licensing requirements for the P420i have evolved through firmware updates: hp smart array p420i license key
Even without a license, a minimum of 512MB Flash Backed Write Cache (FBWC) is required to enable RAID 5, 50, 6, and 60. How to Install a License Key These "Advanced Data Guarding" (ADG) levels provide higher
Advanced Data Mirroring for enhanced redundancy. Changes in Licensing Requirements While it offers robust standard performance
HPE removed the requirement for a SAAP 2.0 license to enable RAID 6 and RAID 60 . Users with this firmware (or newer, such as version 8.32) can use these RAID levels as standard baseline features.
The is an enterprise-class RAID controller integrated into many HPE ProLiant Gen8 servers. While it offers robust standard performance, certain high-end features like RAID 6 , RAID 60 , and HP SmartCache historically required a specific license key for activation . Unlocking Advanced Features