6) What is the difference between Vertical and Horizontal clustering? What is the use of Horizontal and Vertical clusters? Which performance better among these two?
A) ----> Clustering is mainly to provide Fail-over capability. i.e if one server is goes down automatically the other server which is having the same configuration i.e replica of failed server have to serve the application request. This is achieved through the clustering.
----> In realtime we use the horizontal clustering. i e building the replica of servers on different nodes. it provides the fail over capability.
A) ----> Clustering is mainly to provide Fail-over capability. i.e if one server is goes down automatically the other server which is having the same configuration i.e replica of failed server have to serve the application request. This is achieved through the clustering.
----> In realtime we use the horizontal clustering. i e building the replica of servers on different nodes. it provides the fail over capability.
----> In Vertical clustering, we will build the replica of servers on one node which fails to provide the Fail over capability.
7) What happens if a profile is federated to DMGR at that time when it is stopped? What happens to the applications under the Servers in WebSphere 6.0 ?
A) ----> There is no impact on running of applications on the servers when the DMGR is in running or in stopped state.
----> DMGR is just only for admin purpose only. NO applications are running on DMGR
8) what is the difference between system out.log file and trace.log file ?
A) ----> systemout.log and trace.log are almost the same but trace has more description about the JVM rather in other words we can say that trace has more information fortroubleshooting the issue .
----> keep in mind that enable trace only when required and later disable as it will fill up the filesystem and it will effect other application if unnoticed.
9) what are FFDC logs ? what is the use of that ?
A) ----> FFDC is first failure data capture it is a log which the IBM asks when there is a PMR opened with them .
----> you can also analyse the ffdc log through log analyser.
10) If we get page cannot be displayed then how you are going to troubleshoot the issue ?
A) ----> It is a HTTP 404 error. If you get this error we need to check the logs for application Server status. The page expecting by the request is not finding that means request is reaching the server but it is not available at expected location.
---> logs means for application errors or status of your application we have to seen JVM logs (SystemOut.log,Systemerr.log)
----> First try to hit the web server if that is good then hit the application server directly if both of them work then there is an issue with plugin.sometimes the web server will be in hung state kill the web server processes which can be found
----> command ps -ef |grep . kill all the process and restart the web server.
----> Now try the above steps again and also check the status of the app server (JVM)
----> Now try the above steps again and also check the status of the app server (JVM)
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