Idle systems create many systems management server regions
 Technote (FAQ)
 
Problem
Stateful Bean Table maintenance is performed periodically which generates a new Systems Management server region (BBOSMSS) once an hour, even when the system is idle.
 
Solution
WebSphere Application Server for z/OS and OS/390 produces a puzzling number of System Management server regions (BBOSMSS address spaces) on idle systems. Customers observe that a new BBOSMSS server starts up once every hour, lasts for 20 minutes and then terminates. This occurs for as long as WebSphere is active on the system even though it is idle.

These BBOSMSS server regions are created to perform Stateful Bean Table maintenance. Environment variable BEAN_DELETE_SLEEP_TIME controls the interval between Stateful Bean Table cleanups. The default is 4200 seconds or 70 minutes. On an idle WebSphere system the BBOSMSS server region does the Stateful Bean Table maintenance and then waits for more work. It is terminated by WLM after 20 minutes. When the next Stateful Bean Table maintenance is scheduled a new BBOSMSS is created to perform the table maintenance. It then goes idle and is terminated after 20 minutes. This cycle repeats over and over.

Environment variable MIN_SRS=1 for the Systems Management control region can be used to ensure the BBOSMSS server region will not be shut down. There will always be at least one SM server region available to clear the Stateful Bean Session table. This avoids the periodic appearance and disappearance of SM server regions on a totally idle system. Note also that the BBOSMS control region does not stop and restart, only the System Management server region BBOSMSS.

 
 
 


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server for z/OS > EJB Container
Operating system(s): z/OS
Software version: 4.0.1
Software edition:
Reference #: 1052427
IBM Group: Software Group
Modified date: Mar 3, 2004