Below KB articles recommends to migrate to relational database as the messaging queue database instead of using flat file database.
How to move from Hypersonic JBoss 5 messaging database to MSSql or to Oracle in an Identity Manager 12.5 context.
JBoss with Hypersonic messaging queue Database in production environment.
Is is still applicable to the latest version of IDM 14.1 with Jboss 6.x ?
JBOSS 6.x EAP architecture recommends using a SAN based shared storage for messaging data store. See this 18.16. High Availability for more details.
And make sure it's a proper SAN. Don't just use a standard remote "file share". It will cause problems, as we learnt the hard way.
Thank You Leela and Pearse.