brokerName and brokerId in network of brokers

Let's say I set up a network of brokers, where each "node" is a master/slave pair sharing a NFS file system. From my research I should set the brokerName differently on master and slave, but I should set the brokerId the same on master and slave am I correct? >From my research brokerName is used

Why is concurrentStoreAndDispatchTopics option not recommended?

Hello, I was reading http://activemq.apache.org/kahadb.html and found that concurrentStoreAndDispatchTopics option not recommended (so it default to false) while concurrentStoreAndDispatchQueues is default to true (so I assume concurrentStoreAndDispatchQueues is recommended). So why is concurrent