Does SAP Web Application Server available for High Availability (HA)?
Yes, there are several measures to prevent unplanned downtimes eliminating single points of failure. Basically, all critical system components of the SAP Web AS can be configured redundantly. When one single component crashes a remaining component can take over the tasks of the failed one. The SAP Web AS can be used both in local fail-over and disaster recovery scenarios. See High Availability FAQ.