HP smart array p212 raid controller. Only two arrays possible? because of missing RAM on raid card?

raid hardware-raid hp-smart-array

Solution 1:

Only 2 arrays (logical volumes as per HPE) are supported without cache memory. Check controller specifications: https://h20195.www2.hpe.com/v2/getdocument.aspx?docname=c04111625

Logical Volumes Supported

Zero Memory, Up to 2 logical volumes

256mb cache, Up to 64 logical volumes

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