Does a Flowable cluster support running on a database cluster

I am new to Flowable.Is that possible to make Flowable cluster running on a database cluster, instead of sharing a single database?

In our scenario , it will be a lot of process instances to run in concurrent ,which may impose a heavy pressure to a single database .

It depends on how that database cluster is exposed (and that varies between database vendors). If the cluster is accessed by a jdbc url and the clustering happens automatically, it will work out of the box.