Hello
Performance tiering license is required to configure SSDs and HDDs as Virtual Disk Groups within the same system (not necessarily Pool). Without this license, the system can be configured to use SSDs as either an all-flash array or as Read Cache.
This license is sold as part of the Advanced Data Service Suite.
HPE Advanced Data Services (ADS) Software Suite include:
• Performance Tiering and Archive Tiering Software
• 512 Snapshots and Volume Copy Software
• Remote Snap Software
Please refer this URL for more details or to buy the license :
Regards,
Srinivas Bhat
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Note: All of my comments are my own and are not any official representation of the company.