The issue is perhaps that EFS supports NFS4 but with the following limitations:
http://docs.aws.amazon.com/efs/latest/ug/nfs4-unsupported-features.html In particular: "All locks in Amazon EFS are advisory, which means that READ and WRITE operations do not check for conflicting locks before the operation is executed." Whereas the ActiveMQ docs seem to be quite clear on this matter: "Note that the requirements of this failover system are a distributed file system like a SAN for which exclusive file locks work reliably." http://activemq.apache.org/shared-file-system-master-slave.html So I guess that effectively rules out using EFS. -- View this message in context: http://activemq.2283324.n4.nabble.com/Active-MQ-Shared-File-System-Master-Slave-with-Elastic-File-System-tp4715818p4716132.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.