1) Stop WAS.

2) Reboot the server. If the system has been up for a long time it might not be possible to get a contiguous section of memory to allocate the large pages in. You will see this because if you run the sysctl command below it will fail to work. So it is recommended but not critical that the first step is to reboot the server.

3) Run the command:

echo 1536 >  / proc / sys / vm / nr_hugepages

Where 1536 denotes the number of 2MB large pages required, in this case 3GB worth. This setting will not be permanent so you will have to add this to the boot options for the server (/ etc / init.d / boot.local or equivalent).

4) Run more / proc / meminfo and check that it looks something like this at the bottom of the output:

HugePages_Total: 1536

HugePages_Free: 1536

Hugepagesize: 2048kB

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Portal server has a concept of Property Extension Database or which is more commonly known as lookaside database, that you can use to store additional attributes that cannot be stored in the LDAP user registy.

Ex. Lets say you configured portal to use your LDAP server but your LDAP server is either read-only or you need a custom attribute say favoriteMovie that cannot be added to LDAP server. In that case you can configure a lookaside database, and use it store the favoriteMovie attribute for the user.
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If you are getting an error something like this:
“SRVE0068E: Uncaught exception thrown in one of the service methods of the servlet: /jsp/custinfo/CustomerInfoView.jsp. Exception thrown : javax.servlet.ServletException: Duplicate component ID ‘viewns_7_63MG8B1A00CNB0IILUHGC33082_:form1:_id18’ found in view.”

This error related with JSF :
WebSphere Application Server’s JSF implementation generates new
client IDs for some JSF components on a post back. These new
IDs can collide with the cached client IDs when the order of
the components change, or a new component requests an ID that
did not do so in the previous request.

Work around to fix this issue:

To prevent collision with existing client IDs, the
com.ibm.ws.jsf.storeDynamicClientIds property must be set to
“true” in the web.xml file.

com.ibm.ws.jsf.storeDynamicClientIds true

Since Websphere Portal 6.1 we can use friendly URL on my pages. Page Properties portlet provides an additional field which specifies the URL suffix which will be appended to portal URL:

The service is disabled by default. To enable it:

You can confirm that my friendly URL works when you navigate to the following URL:

http://myserver:10040/wps/myportal/mypage

Another confusing thing related to friendly URLs is that a path must reflect pages hierarchy. The above example works only when My Page is placed below Content Root. In order to place the page under Home, a friendly URL for Home label must be also created (for example: home) and then the path to My Page would be:

http://myserver:10040/wps/myportal/home/mypage

Note: I guess there is a bug . If you use friendly URL label name’s first chracter with uppercase like “Home”   for Home page  You can getting endless loop error when calling page.

1- Create a group (ihsgrp) and a user (ihsadm) for the IHS (IBM Http Server)

2- Change owner for IHS
chown –R ihsadm:ihsgrp /opt/IBMIHS61

3- Edit the httpd.conf file so that the web server runs with the user ihsadm and the group ihsgrp
User ihsadmin
Group ihsgrp

4- Edit visudo to add belowed line for linux:
wasadm ALL=NOPASSWD: /opt/IBMIHS60/bin/apachectl -k start -f /opt/IBMIHS60/conf/httpd.conf, /opt/IBMIHS60/bin/apachectl -k stop -f /opt/IBMIHS60/conf/httpd.conf

5- Create run.sh file in IHS/bind directory and add this command:
/usr/bin/sudo /opt/IBMIHS61/bin/apachectl “$@”

6- Change owner for run.sh so wasadm user can execute
chown wasadm:wasgrp run.sh

7- Change startCommand and stopCommand parameter values:
Go webserver properties page of the admin console
Web servers > TWSWKI0101TR > Process Definition

startCommand : ${WEB_INSTALL_ROOT}/bin/run.sh
stopCommand : ${WEB_INSTALL_ROOT}/bin/run.sh

If you have a page for which users have Priveleged user rights then then can customize/ personalize that page. When any of the user does that the portal server will create a private page and store that information in customization database domain(The actual page layout is stored in the RELEASE database domain). Now when you delete that page the main page would get deleted from RELEASE database domain( either immediately or at the time of schedule cleanup) but the personalized page that is stored in the CUSTOMIZATION domain wont be deleted. This page would be included in your database backup. You can delete the private page from the CUSTOMIZATION database domain by following these steps.
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If you want to change your node names you can follow this steps:

1- Stop nodes except deployment manager

2 – Execute following command at /bin directory:

./renameNode.sh dmgr01 16003 node1 -username wpsbind -password wpsbind -logfile (renameNode.sh dmgr_host dmgr_port node_name ) changenode.txt

3- Execute following command at /ConfigEngine directory:

/ConfigEngine.sh rename-node-in-cell-registry -DWasPassword=wpsbind -DpreviousNodeName=node1 (./ConfigEngine.sh rename-node-in-cell-registry -DWasPassword=password -DpreviousNodeName=oldNodeName )

4- Edit deployment.xml files with new nodename under /config/application/ at dmgr machine

FOR  6.0.x

1- locate <dmgrprofile>/config/wmm/

2- add properties  in  wmmAttributes.xml  and wmmLDAPServerAttributes.xml files.

Caution:  wmmAttributes.xml uses attribute properties  ,  wmmLDAPServerAttributes.xml uses attributeMap properties.

/IBM/Profiles/Dmgr/config/wmm/wmmAttributes.xml

          <attribute wmmAttributeName=”workingBranch”
                applicableMemberTypes=”Person”
                dataType=”String”
                valueLength=”128″
                multiValued=”true”/>

/IBM/Profiles/Dmgr/config/wmm/wmmLDAPServerAttributes.xml

        <attributeMap wmmAttributeName=”workingBranch”
                pluginAttributeName=”workingBranch”
                applicableMemberTypes=”Person”
                dataType=”String”
                valueLength=”128″
                multiValued=”true”/>
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Following technote’s  suggestion was’nt work corrently on my Portal Servers. So I have prapered new procedure for me .

http://www-01.ibm.com/support/docview.wss?rs=688&context=SSHRKX&context=SS3JLV&context=SS3NNG&context=SSYJ99&context=SSRUWN&context=SS6JVW&q1=hostname+change&uid=swg21390600&loc=en_US&cs=utf-8&lang=en

http://www-01.ibm.com/support/docview.wss?uid=swg21304780

My configuration:

For Websphere Administrative Console Machine:

1- Stop dmgr ,nodes,instances processes. Change hostname on server

2-Modify   hostnames with new hostname  in  <dmgrprofile>/config/../dmgrnode/serverindex.xml and virtualhost.xml

3- Modify com.ibm.ws.scripting.host parameter  in wsadmin.properties on <profileroot>/properties  both servers (dmgr and nodes)

4- Clean  under dmgrprofile and nodeprofiles temp,wstemp folders.

5-  Start dmgr.

6-Sync nodes with synNode command and start nodes.

For Node  Machines:

1- Stop nodes,instances processes. Change hostname on node servers

2-Modify   hostnames with new hostname  in  <dmgrprofile>/config/…/node/serverindex.xml

3- Modify com.ibm.ws.scripting.host parameter  in wsadmin.properties on <profileroot>/properties  both servers (dmgr and nodes)

4- Clean  under nodeprofiles temp,wstemp folders.

5-Sync nodes with synNode command and start nodes.

6-Star node

7- Download file at following link http://www-01.ibm.com/support/docview.wss?uid=swg21304780 . Extract it into your /ConfigeEngine

8- run following script : ./ConfigEngine .sh localize-clone

9- Verify that the /ConfigEngine/properties/wkplc.properties has been updated with the new hostname.