Vista WebSphere MQ is always the local file system for distributed platforms. On the mainframe, it is possible to use the DB2 database in Sysplex using the communication mechanism, but for everything else it is a file system.
In addition, there is no local persistence for WebSphere MQ clients. Only the queue manager will save messages.
WebSphere WebSphere Application Server System Integration Bus . SIBus - JMS, WAS WAS WAS.