Post by Andrea Mauro (thank you)
VMware vSphere Storage Appliance was a software-based shared storage solution that enables high availability and automation in vSphere without shared storage hardware (for more information see this post). VMware has announced the End of Availability of all vSphere Storage Appliance versions, effective April 1, 2014. After this date you will no longer be able to purchase this product.
All support and maintenance for vSphere Storage Appliance 5.5 will be unaffected and will continue to follow the Enterprise Infrastructure Support Policy. The End of General Support life date for customers with vSphere Storage Appliance 5.5 remains September 19, 2018.
Read on here