Is it possible to patch clustered SQL Server without a BizTalk outage?

Question

We have a BizTalk Server install backed by a clustered SQL environment for high availability.

However, whenever the SQL environment is patched there is a momentary outage as part of node failover. Consequently the host instances stop and BizTalk shuts down (if we move to CU2 the host instances will automatically restart, but this is a separate issue).

This is undesirable, as it prevents incoming web requests and breaks open web service clients. As such, is there a strategy for gracefully patching SQL Server without a BizTalk outage?

Answer 1

It seems this is impossible. Marking this as the accepted answer until someone can pleasantly surprise me otherwise.