As you are dealing with MSA2050 which means your are dealing with Pool and Virtual Disk Group. From Pool you have created Volumes.
Please note that Controller only takes care of Pool and Virtual Disk Group (VDG) availability.
Volume availability depends upon how you have presented the volume to host. To be specific if volume presented to host with all Host ports or some host ports of both controllers or not. If not then volume will not failover successfully and you will face outage. Technically multi-path need to be configured from Host to both controllers of MSA
Hope this helps!
Regards
Subhajit
I am an HPE employee
If you feel this was helpful please click the KUDOS! thumb below!
***************************************************************************