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Ask the Experts Replay: Understanding HA Manager, WLM, and ORB in WebSphere Application Server

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Abstract

The High Availability Manager (HA), Work Load Management (WLM), and Object Request Broker (ORB) component provide several core features in WebSphere Application Server. This session is open to discuss the concepts, issues, and best practices of each component.

Content



Ask the Experts sessions are conducted in a question and answer format. The table below provides a time index (minutes:seconds) to the recording and describes the questions or topics discussed. You can fast forward to any question using the time index, a table containing the panel of experts is also included.

To play or download the audio of this Ask the Experts session, see the Audio Section of this document.

See the Related Information Section of this document for a list of documents referenced during the presentation.




Ask the Experts session
06 October 2015 - 11:00 a.m. - 12:00 p.m. EDT

TimeQuestions asked
00:00Silence
00:02General introduction
03:50Introduction of Panel of Experts
05:55Technical introduction
06:37What causes CWRLS0030W or DCSV8030I messages in the SystemOut.log file?
09:29What causes HA instability or "split brain" issue?
11:06Do my cellnames need to be unique?
12:43What is the consequence of having multiple ORBs in my JVM from running ORB.init()?
19:57I see strange / unpredictable WLM behavior or performance problems. How do I figure out the problem?
32:40What is the role of HA Manager Bulletin Board service?
33:45What is the role of the nodeagents location service daemon for ORB high availability and load balancing?
38:06Customer environment has one JVM that is hanging and is unable to start another JVM. Why is this occuring? How can this be resolved? See "CWRLS0030W message continuously logged and WAS fails" in Related information for link referenced in this answer.
39:44Do we see any message in SystemOut.log before we enable ORB Trace to identify multiple ORBs?
42:17We see CWRLS0030W or DCSV8030I messages in the systemout.log. What is the solution to fix that, so that the JVMs doesn't wait for the go-ahead from the HA manager? Is there any permanent fix for this other than restarting the HA manager itself? See "Top 10 things to know about HA Manager" in Related information for link referenced in this answer.
45:35What is the recommended cell size or core group? See "How to set Protocol" in Related information for link referenced in this answer.
48:40What is the correct way to bootstrap? See "Getting an initial context" in Related information for link referenced in this answer..
50:20On z/OS, if node agent is not started will this prevent WLM from work properly?
51:23What is the consequence of having multiple ORBs in my JVM from running ORB.init()?
53:28What is meant by good system for core-group?
54:47 For the workaround, how do we get the JVM property to ignore transaction recovery? See "3 Ways to Resolve CWRL0030W" in Related information for link referenced in this answer.
55:22Closing remarks
58:42End of Call

Panel of Experts:
Hobert Bush IIIWebSphere Team Lead, Client Success
Kumaran NathanIBM WebSphere Level 2 Customer Support
Claudia S. BarrettWebSphere ORB L3 Support
Thomas F. SeelbachWebSphere Development
Adam WisniewskiWebSphere on z/OS, HA Manager, & Liberty Dev/Service


Audio

To replay the recording of this conference call, click on Download Audio (audio in MP3 format, Length: 58 minutes, 42 seconds). Right-click and select Save As to store the file on your local computer for later playback. Remember that you can fast forward to any question using the time index.

Original Publication Date

20 October 2015

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Document Information

Modified date:
17 June 2018

UID

swg27046320