Adaptive Server Cluster Edition version 15.5 and later support multiple simultaneous instance failures.
Multiple simultaneous failure support occurs when more than one instance fails within a single cluster view, but the cluster remains online and provides the same failover recovery as it does when a single instance fails.
The number of failures cannot be greater than the value for cluster redundancy level, a configuration parameter that allows a database administrator to set the maximum number of recoverable simultaneous instance failures for the cluster.