We have seen issues when running Jboss 4.2.3 with JBoss Messaging 1.4.2.GA-SP1 using MS SQL 2008 R2 for the data-store where in high volume environments the disk usage is disproportionate to the volume of messages being persisted.
I know that there is a known behaviour with MS SQL and the following note from JBoss messaging docs explains this,
Microsoft SQL Server does not automatically de-allocate the hard-drive space occupied by data in a database when that data is deleted. If used as a data-store for services that temporarily store many records, such as a messaging service, the disk space used will grow to be much greater than the amount of data actually being stored. Your database administrator should implement database maintenance plans to ensure that unused space is reclaimed. Please refer to your Microsoft SQL Server documentation for the DBCC commands ShrinkDatabase and UpdateUsage for guidance. https://jira.jboss.org/jira/browse/SOA-629
however we have seen the JBM_MSG table grow beyond the volumes actually being submitted, we have other similar environments that do not exhibit the same behaviour. Users believe the number that each message is consuming 5mb for what would only be at most few hundred KB message and is actually consming 200MB of disk to store this, obviously this sounds like an issue with SQL Server and we have opened a ticket with Microsoft but was sseeing if anyone else had seen this.
Thanks