IBM Software Group © 2009 IBM Corporation IBM Tivoli Composite Application Manager for WebSphere – Tuning and Best Practices.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 2 Special thanks to :  Earlier Best Practices Presentation –Rama Shetty  Performance Tuning Guides –Brad Winslow –Xiaojun Chai –Ravi Gadekarla –Yasutaka Hirasawa –Aaron Lieber –Rich Mackler –Donna Martin  Tuning Guide URLs: –http://www.ibm.com/developerworks/wikis/display/tivolimonitoring/ITCAM+for+We bSphere+J2EE+V6.1+Product+Performance+Tuning+Guide –http://www.ibm.com/developerworks/wikis/display/tivolimonitoring/ITCAM+for+We bSphere+Application+Server+and+J2EE+V6.1+Data+Collector+Performance+Tu ning+Guide

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 3 Agenda  Overview –Architecture –Data Flow –Monitoring on Demand  Data Collector –Installation and Configuration Steps  Managing Server –Tuning the Publish Server –Tuning the Visualization Engine –Heap Size –Database –Configuration –Pruning and Maintenance  Other Sources of Information

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 5 What is ITCAM for WebSphere? IBM Tivoli Composite Application Manager (ITCAM) for WebSphere is a product that provides users with  The capability to monitor mission critical J2EE applications running on WebSphere and  A way to conduct deep-dive diagnostics of issues found through monitoring

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 6 ITCAM for WebSphere Components Managing Server (MS)  A J2EE application that is configured within WAS  Serves as the control center of your installation when using the ITCAM Console  Collects information from, and provides services to, the Data Collectors in your environment Data Collector (DC)  Runs on each monitored Application Server and communicates essential operational data to the Managing Server or TEMA. Tivoli Enterprise Monitoring Agent (TEMA)  Gets information from the Data Collectors and sends it to the IBM Tivoli Monitoring (ITM) environment when the Tivoli Enterprise Portal (TEP) interface is being used.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 8 Data Collector  Runs on WebSphere Application Server (WAS)  There is one DC for each Application Server within WAS where applications are being monitored  Collects all transaction and request metrics, Java Virtual Machine metrics, WebSphere PMI metrics and other type of information such as thread and heap dumps  Incurs a certain level of performance overhead for the Application Server depending upon the degree of monitoring

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 9 Managing Server  Kernel –Central controller of the WSAM Application Monitor –Registers components as they join –Periodically renews connections –Collects availability information  Visualization Engine –Provides web-based GUI to the end user –Provides access to graphics, reports and views of different slices of data –Provides access to command & event functions of ITCAM –J2EE application (ITCAM_Application) that runs on the WAS AppServer  Publish Server –Receives event data from Data Collectors –Computes request level information, such as response time –Implements trap monitoring and alerts

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 10  Global Publish Server –Collects information from Publish Sever –Correlates multi-server requests, e.g., WAS to CICS transaction  Archive Agent –Receives data from Publish Server –Stores data in Performance Analysis Database  Message Dispatcher –Conduit for messages from ITCAM –Uses Email & SNMP Managing Server …

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 11 ITM and ITCAM for WebSphere Architecture … WebSphere Tivoli Enterprise Monitoring Agent Note: There is one Data Collector for each WebSphere AppServer: there is One to many Data Collectors for each TEMA on a given machine.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 12 ITM Capabilities – Tivoli Enterprise Portal  IBM Tivoli Monitoring (ITM) V6.x provides a common look and feel for Tivoli products using Tivoli Enterprise Portal (TEP)  TEP provides easy-to-customize workspaces  TEP dashboard allows users to graphically demonstrate the application and business impact of problems  TEP dashboard can combine data from other Tivoli products, to give a complete view of the WebSphere Infrastructure across the enterprise

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 13 ITM Architecture – TEMS, TEPS and TEP  TEMA connects to the Tivoli Enterprise Management Server (TEMS) –There is a single hub TEMS –Optionally, there are many remote TEMS to provide scalability –Optionally, there is a hot standby feature with a backup TEMS  TEMS uses the Tivoli Data Warehouse (TDW) for long-term history  Tivoli Enterprise Portal Server (TEPS) connects to the hub TEMS –Manages ITM Consoles (TEP) –Manages user preferences, customized workspaces, etc  Users log on to the Tivoli Enterprise Portal (TEP) –TEP browser –TEP desktop client –TEP java applet

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 14 What is ITCAM for J2EE? Monitors applications running on the following :  WebLogic  SAP  Oracle  JBoss  Tomcat  J2SE  IBM WebSphere Application Server Community Edition  SJSAS (Sun Java System ApplicationServer) FP3, iFix4

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 15 What is ITCAM for Web Resources 6.2?  Includes equivalent of ITCAM for WAS and ITCAM for J2EE TEMAs  Uses DC from ITCAM for WAS or ITCAM for J2EE  * Web Server TEMA does not have a Data Collector Note: There is one Data Collector for each WebSphere AppServer: there is One to many Data Collectors for each TEMA on a given machine.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 19 Monitor on Demand (MOD)  Three MOD levels: –Mod Level 1: Production –Mod Level 2: Problem Determination –Mod Level 3: Trace  MOD levels can be dynamically changed using the MS Console  Control the MOD level automatically using user-defined schedules Performance Cost

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 20  Production mode  Default monitoring level  Least intrusive monitoring level  This monitoring level provides –Availability data –System Resources data –Basic request level data MOD Level 1

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 21 MOD Level 2  Problem determination mode  Includes all of MOD Level 1 capabilities  Narrows scope of the problem to the right tier/ component –SQL, EJB, JNDI, JMS, JCA, JavaMail, MQI  Captures Lock Contention data using a technique called Byte Code Instrumentation (BCI)

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 22 MOD Level 3  Captures all MOD Level 1 and 2 data  Captures Memory Leak Diagnosis and Method Trace using a technique called Byte Code Instrumentation (BCI)  Classes of interest must be instrumented before detailed method entry and exit data can be collected  Higher overhead than the other monitoring levels

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 23 Choosing the MOD Level  Choosing the level of data collection is a trade- off between more information and impacting performance.  Focus on the quality and reduce quantity of data analyzed.  Filter unwanted classes from L2 and L3 instrumentation.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 24 Right data at the right place  Isolate sluggish transaction using L1 and L2 monitoring in Production.  If problem cannot be isolated, replicate conditions in test environment and use L3 monitoring to locate misbehaving classes/methods.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 25 Right data at the right place  Alternatively, in a cluster environment redirect misbehaving transactions to cluster member running L3 mode.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 27 Data Collector – A Step-by-Step Approach  Step 1: Installation  Step 2: JVM Tuning  Step 3: PMI Counter Tuning  Step 4: DC Internal Buffer Tuning  Step 5: Setting the Byte Code Instrumentation (BCI) Engine  Step 6: MOD Level 2 Instrumentation Fine Tuning  Step 7: MOD Level 2 Method Profiling  Step 8: Apply MOD Level 3 Method Filtering  Step 9: SMF Tuning (z/OS Only)  Step 10: Disable DC when no monitoring is needed

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 28 Step 1: Installation  Installation –Install one time per machine or LPAR, multiple DCs can use this –Get to latest fix level http://www.ibm.com/support/docview.wss?uid=swg21300120 –Managing Server must be the same fix pack level or later than the DCs If DC is 6.1, MS must be 6.1 or later If DC is 6.1 FP4, MS must be 6.1 FP4 or later If DC is 6.1 FP4, iFix1, MS must be 6.1 FP4 or later  Configuration (covered in remaining Steps) The Data Collector is the most important component in the system, from a tuning perspective. It resides inside the JVM of the monitored application server, so it is very important to keep in mind that it competes with the monitored applications for resources.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 29 Step 2: JVM Tuning  Garbage Collection (GC) Interval Installation of the ITCAM Data Collector will cause the need for distributed GC since ITCAM is essentially an RMI application. Default GC interval is 1 minute. To set the garbage collection interval to 1 hour, add the following generic JVM arguments. If more frequent GCs are needed, they will take place implicitly: -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 Note: As of DC Fixpack 3, iFix 10, these parms are automatically set during configuration. However, if the DC was configured previously, these settings will only be added if the DC is unconfigured and reconfigured.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 30 Step 2: JVM Tuning …  Garbage Collection and Class Reuse Originally, ITCAM for WebSphere added -Xnoclassgc to the JVM genereicJvmArguments to allow for more class reuse. It was later discovered that the -Xnoclassgc parameter should be used with caution because it can lead to native memory exhaustion and cause the JVM to create an out of memory exception. We have found that this parameter does, indeed, negatively affect performance when set with ITCAM. Remove -Xnoclassgc from the generic JVM Arguments

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 31 Step 2: JVM Tuning …  Garbage Collection policy Concurrent marking is disabled by default. Enabling concurrent marking may significantly reduce the cost of garbage collection. To enable concurrent marking add the following generic JVM argument: -Xgcpolicy:optavgpause  RMI Connection Pooling CPU utilization can be reduced by reusing RMI connections rather than forking and creating a new connection whenever one is needed. Again, the ITCAM Data Collector is essentially an RMI application and will benefit by enabling connection pooling (off by default). To enable RMI connection pooling add the following generic JVM arguments: -Dsun.rmi.transport.tcp.connectionPool=true

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 32 Step 3: PMI Counter Tuning (MOD Level 1,2,3)  Settings go into /runtime/.. /custom/ datacollector_custom.properties  To enable custom PMI (Performance Monitoring Infrastructure), use am.pmi.settings.nochange=false  Change the PMI setting for PMI level: –am.was6custompmi.settings.[1,2,3]=[none, basic, extended, custom, all] e.g. am.was6custompmi.settings.1=basic  Change the PMI setting for a particular PMI module: –PMI Modules beanModule cacheModule connectionPoolModule j2cModule jvmRuntimeModule orbPerfModule servletSessionsModule systemModule threadPoolModule transactionModule webAppModule –am.was6custompmi.settings.[1,2,3]=[PMIModule]=[none, basic, extended, custom, all] am.was6custompmi.settings.1=beanmodule=none

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 33 Step 4: DC Internal Buffer Tuning The following tuning helps prevent dropped records.  Data Collector (generated datacollector.properties) –Set internal.probe.event.queue.size.limit=50000 to increase the internal queue size limit. This prevents dropping records due to high throughput or huge method traces. The default is 5000, which is more appropriate for Mod Level 1 or 2. –Set internal.probe.event.packet.size=50000 to increase the size of the Data Collector’s internal send buffer. The send buffer controls how much data the Data Collector can be sent to the Publish Server at a given time. The default is 5000. –Set internal.memory.limit=120 to increase the maximum native memory the Data Collector will consume. The default is 100M. Increase this value if Data Collector is dropping records (check datacollector.log file).  Additional setting for the DC in the datacollector.properties (although not related to buffer tuning) –Set am.rmisocket.timeout=60000 for all Data Collectors

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 34 Step 4: DC Internal Buffer Tuning …  Publish Server (ps1.properties and ps2.properties) –Set cyanea.ps.aa.maxQueueLength=2000000 to increase the internal queue length limit. Increase this value if the Publish Server is dropping records (check ps1.log and ps2.log files).  Archive Agent (aa1.properties and aa2.properties) –Set queues.method.size=2000000 to increase the queue size limit for method data. Increase this value if the Archive Agent is dropping records (check aa1.log and aa2.log files for exceeding maximum queue size limit warning message).  Heap –The Publish Servers and Archive Agents may run out of memory after increasing these limits. On the Managing Server, in setenv.sh: Set HEAP_MAX_SIZE_PS=1024 Set HEAP_MAX_SIZE_ARCHIVE_AGENT=1024 –Restart both Managing Server and Data Collector after making changes.Timeout for Remote Method

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 35 Step 5: Setting the ASM Based BCI Engine  BCI is a technique that ITCAM for WebSphere Data Collector uses to collect L2 Method Profiling, L3 tracing data, Memory Leak Diagnosis data, and Lock Contention data from J2EE applications.  ASM Based BCI Engine replaces AspectJ instrumentation as of 6.1.0.3-TIV- ITCAMfWAS_MP-IF0010  Pre FP4 - To Enable the ASM Based BCI Engine: –In the /runtime/.. /custom/toolkit_custom.properties file, uncomment: #am.camtoolkit.gpe.probifier.factory=com.ibm.tivoli.itcam.toolkit.ai.bci.engine.BCIEngi neProbifierFactory –Save changes and restart the DC Server.  After FP4, ASM is enabled by default, Aspectj is not supported  After FP4, allow data collector to add new fields or methods to instrumented classes: Define the following properties to the DCHOME/runtime/ /custom/toolkit_custom.properties file: am.camtoolkit.gpe.bci.allow.new.fields=true com.ibm.tivoli.itcam.toolkit.ai.createRememberedObjectField=true

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 36 Step 6: MOD Level 2 Instrumentation Fine Tuning  Default: A ll the L2 modules are set to true initially, Lock Analysis and Heap Dump analysis must be instrumented however  Properties File: /runtime/ /custom/toolkit_custom.properties –com.ibm.tivoli.itcam.toolkit.ai.enableejb=false # disables EJB instrumentation –com.ibm.tivoli.itcam.toolkit.ai.enablejca=false # disables JCA instrumentation –com.ibm.tivoli.itcam.toolkit.ai.enablejdbc=false # disables JDBC instrumentation –com.ibm.tivoli.itcam.toolkit.ai.enablejndi=false # disables JNDI instrumentation –com.ibm.tivoli.itcam.toolkit.ai.enablejms=false # disables JMS instrumentation –com.ibm.tivoli.itcam.toolkit.ai.enableservlet=false # disables servlet instrumentation –com.ibm.tivoli.itcam.dc.ctg.enablectg=false # disables CTG instrumentation –com.ibm.tivoli.itcam.toolkit.ai.enablesessioncount=false # disables HTTP Session cntg instr.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 37 Step 7: MOD Level 2 Method Profiling  Select Method Profiling in Monitoring on Demand page.  Provide time interval to aggregate and send data to MS  Configure L3 monitoring & include classes of interest for instrumentation using L3 Method trace setup  Use Method profiling report to study average CPU and average response times per method.  Though the information is aggregated over multiple transactions, it may be better suited to analyze slow transactions.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 38 Step 7: MOD Level 2 Method Profiling …  There are settings in the datacollector.properties for Method Profiling that need to be reviewed. Table size may need increasing, for example.  Reduce DC data traffic to MS, Use L2-Method Profiling instead of L3 Method trace.  Move to L3 only if deeper method level trace for individual transaction is required [Use traps].

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 39 Step 8: Apply MOD Level 3 Method Filtering  Reduce overhead in L3 monitoring by narrowing instrumentation to classes and methods of interest.  In the /runtime/.. /custom/ exclude.xml file, add: com.lowagie.* AG13.SystemAdmin.SCheckAccountNumber org.apache.struts.util.ErrorMessages  In the /runtime/.. /custom/ toolkit_custom.properties file, add the following if it is not there: am.camtoolkit.gpe.customxml.exclude=exclude.xml  Recycle WAS AppServer

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 40 Step 9: SMF Tuning (z/OS Only)  Increase SMF recording interval (default is 2 minutes, in Control Region) –Log in to the WebSphere Application Server administrative console. –Select Server -> Application Servers -> -> Server Infrastructure / Java and Process Management / Process Definition -> Control [for Prcess Type] -> Additional Properties: Custom Properties –Select server_SMF_interval_length –Change the value to 360, or 6 minutes. –Click Apply, Save, and synchronize nodes as appropriate.  Turn off writing of SMF records if not needed –Issue the following command to the CYN1 subsystem: F [ xxxx | yyyy ],SMFWRITE OFF Where xxxx = name of proc [ ex. CYN1PROC ] - or if an ID was assigned yyyy = id assigned to the CYN1 started task –To verify, issue: F [ xxxx | yyyy ], SMFWRITE SHOW

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 41 Step 9: Disable DC when no monitoring is needed  Disable the DC dynamically if no monitoring is needed  Default: DC is enabled  To disable the DC dynamically (no data flowing to MS): –Go to the ITCAM console –Select : Administration  Server Management  Data Collector Configuration –Select the “Disable” Button  To disable the DC completely (no monitoring on DC, no data flowing to MS): –Change -Xrunam.... to -DXrunam in GenericJvmArguments –(Note: After FP1 the -Xrunam was changed to -agentlib:am for WAS61) –Change -Xbootclasspath to -DXbootclasspath in GenericJvmArguments –For WAS 6.1 and above, disable the ‘am’ custom service –You can do this via the WAS Admin Console or by editing server.xml.

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 43 Managing Server – Publish Server  The Publish Server is the second-most important component to tune, right behind the data collector. –DC sends a record for every request entry and exit to the Publish Server, regardless of sampling rate –The volume of data handled by this component is quite high  The memory requirements are listed in MS_HOME>/bin/setenv.sh file. –HEAP_MIN_SIZE_PS = 512 –HEAP_MAX_SIZE_PS=1024 (default 512)  Rule of thumb when setting up your Managing Server –At least 1 AA for every 2 PS –In large environments where more than 500 requests per second (1.8 M per hour) are generate Have least 4 instances of Publish Server and 4 instances of Archive Agents running

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 44 Managing Server – Component Heap Size  In an environment with a high volume of requests, beside increasing the heap size for the Publish Server, it is recommended to increase the heap size of the Kernel and Archive Agent.  The following example shows heap size configuration in setenv.sh for an environment with around 250 Data Collectors uploading a total of 500 requests per second –HEAP_MIN_SIZE_PS = 512 –HEAP_MAX_SIZE_PS 1024 –HEAP_MIN_SIZE_KERNEL = 512 –HEAP_MAX_SIZE_KERNEL = 1024 –HEAP_MIN_SIZE_ARCHIVE_AGENT = 512 –HEAP_MAX_SIZE_ARCHIVE_AGENT = 1024

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 45 Managing Server – Visualization Engine  Sampling Rate –Determines the percent of requests that are archived to the database –Generally, a 2% sampling rate is suggested. This value should be adjusted based on the rate of growth of the database tables, and organizational requirements. –Set from the Monitoring On Demand screen for a group or a single data collector –Users can see requests that have hung All requests, regardless of sampling rate, are sent to the Publish Server. –In-flight –Traps work on all requests  Maximum Methods Per Request –The default value is 10,000 –Setting the value to 2,000,000 should cover most situations –This value can be set from the Managing Server Console by selecting Administration, Managing Server, System Properties, Data Collection

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 46 Managing Server – Database Configuration  In an environment with high volume of requests, increase –MAXAPPLS - maximum number of concurrent applications that can be connected –MAXAGENTS - maximum number of database manager agents The value of maxagents should be at least the sum of the values for maxappls in each database allowed to be accessed concurrently  The example below shows database configuration update for DB2: –db2 update db cfg for octigate using MAXAPPLS 300 –db2 update db cfg for octigate using MAXAGENTS 500  Increase space allocated by DB2 for your ITCAM Database (octigate) Even if you have a lot of space on your file system, DB2 may be limiting your space. Check the space allocated within DB2: db2 connect to octigate, db2 get db cfg –Log file size (4KB) (LOGFILSIZ) = 25000 –Number of primary log files (LOGPRIMARY)= 5 –Number of secondary log files (LOGSECOND) = 4. The example below increases the secondary allocation to 100: –db2 update db cfg for octigate using logsecond 100

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 47 Managing Server – Database Pruning and Maintenance  Pruning data in the Managing Server database frequently improves database performance and minimizes the disk space needed to store the data.  ITCAM for WebSphere provides utilities to delete old data from the database. The first Data Trimmer utility is built-in in to the Archive Agent. This utility is designed to prune high volume monitoring data that are not necessary for historical reports. With this utilities enabled, the Archive Agent will prune data in the following tables every 2 hours and keep 2 days worth of data each time it runs. –MEMORY_DATA –GC_DATA –MQI_QUEUEMGR_SR_OVERVIEW –MQI_QUEUE_SR_OVERVIEW –CTG_SR_OVERVIEW –WBI_REQUEST –WEBSERVERCHARTDATA –IMSTHREADS –VOLUMESTAT –PORTALSTATS

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 48 Managing Server – Database Pruning and Maintenance…  The second Data Trimmer utility is a script (datatrim.sh) which needs to be run on a regular basis using native operating system scheduler tools such as cron task or Windows scheduler. We recommend saving 7 days worth of history and pruning nightly.  It is important to notice that the Archive Agent is hard-coded to delete data from the above tables. Therefore, before running the Data Trimmer script, check the following properties files to ensure that the script does not delete the same tables as the Archive Agent – /etc/deletesingletable.xml – /etc/deleterelatedtables.xml  Refer to Appendix F. Maintaining the monitoring environment of the Managing Server Installation and Customization Guide for procedure to enable Data Trimmer.  Maintenance Requirements –Execute /bin/run-stat-cmds.sh daily –REORGCHK should be run on the REQUEST table daily –REORG should be run once in a while

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 49 Managing Server – OS File Descriptors  By default, the OS file descriptor setting is 1024. To check the setting on the Managing Server, open a Korn Shell and execute "ulimit -a".  Check the MaxOpenFiles (may be called File Descriptors on different OSes).  If the value is less than 2000, you will have to increase it.  To increase this setting for UNIX, log on as root and execute:  ulimit -n 2000  This is a permanent change (verify with ulimit -a).

IBM Software Group | Tivoli software © 2009 IBM Corporation ITCAM for WebSphere 51 Other Sources of Information  InfoCenter Publications –http://publib.boulder.ibm.com/infocenter/tivihelp/v3r1/index.jsp?topic=/com.ibm.itcamwas.doc_6.1/w elcome.htm  ITCAM for WAS Support Product Page –http://www.ibm.com/software/sysmgmt/products/support/IBMTivoliCompositeApplicationManagerfor WebSphere.html  External Wiki - IBM® Tivoli® Distributed Monitoring and Application Management –http://www.ibm.com/developerworks/wikis/display/tivolimonitoring/home  Internal Wiki - Virtual Community for AABSM (IBMers only) –http://w3.tap.ibm.com/w3ki06/display/CAMVirtCom/Home  System Requirements –http://www.ibm.com/support/docview.wss?uid=swg21300121  Recommended Fixes –http://www.ibm.com/support/docview.wss?uid=swg21300120  Fixes by Version –http://www.ibm.com/support/docview.wss?rs=2344&uid=swg21300119  Must Gather Documentation –http://www.ibm.com/support/docview.wss?uid=swg21300124  Featured Documents –http://www.ibm.com/support/docview.wss?rs=2344&uid=swg21300122

IBM Software Group © 2009 IBM Corporation IBM Tivoli Composite Application Manager for WebSphere – Tuning and Best Practices.

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IBM Software Group © 2009 IBM Corporation IBM Tivoli Composite Application Manager for WebSphere – Tuning and Best Practices.

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