Hi Akshay - disclaimer, I am not a lawyer and I am simply trying to help provide you with public information to better answer your questions. From your questions and from reading the online HIPAA documentation, it would be best that you contact
your Microsoft Account Manager
as Microsoft currently offers the BAA to customers who have a Volume Licensing / Enterprise Agreement (EA).
1. Is Azure SQL Database is covered under HIPAA compliance?
Yes, please see the following [link][link][link]
2. Will MS sign HIPAA BAA?
Microsoft currently offers the BAA to customers who have a Volume Licensing / Enterprise Agreement (EA) [link]
3. How feasible it is to store the databases of more than one HIPAA compliant applications on the same server ? Database is SQL. Does this violate HIPAA?
Azure SQL Database as a cloud platform is HIPAA compliant. In respect to the application that is built on top of SQL Database, this is a difficult question to answer in a forum as the response is completely contingent on the design and implementation of
the application. Please see the following for more information [link].
4. I am willing to host multiple client's DB on same server into separate instances, is it possible?
Azure SQL Database provisions databases that are grouped under a logical
server. The databases, however, are likely not on the same physical
server.
5. Do MS have SAN ?
I'm not positive what you're asking, can you please clarify?
6. How do MS separate the data of more than one HIPAA compliant app from each other ?
Same answer as questions 3