Hi Jason,
There is no function or configuration change to be made in MSA to work as dual controller.MSA is designed to work in dual controller mode when there are 2 controllers installed.
For the array to failover to the partner controller you need to have redundant paths(managed through multipath software)
In the case of a direct attach configuration, the best practice is to have at least two connections to the array for each server. In the case of a direct
attach configuration with dual controllers, the best practice is to have at least one connection to each controller.
Please check the links below for better understanding,
Best pactice https://h20195.www2.hpe.com/v2/getpdf.aspx/A00015961ENW.pdf? (page 27)
cabling https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-a00028199en_us&docLocale=en_US
MSA 2050(gen 5) virtualization technology
https://h20195.www2.hpe.com/v2/Getdocument.aspx?docname=a00087404enw
Please let me know if this helps!
Thanks