HP StorageWorks Application Recovery Manager Administrator's Guide (T4395-96004, February 2008)

Internal Database Maintenance
Purging the IDB
Chapter 5 77
Purging the IDB
By default, the information about sessions is kept in the database for 365
days.
You can set the interval after which the sessions are purged by setting
the KeepDiskonlySessions variable in the global options file.
See the online Help index: “global options file, modifying”.