The maximum size of core files may be 0 depending on the operation environment of the system. In such cases, core dumps cannot be acquired during abnormal termination of server processes, and therefore, you need to set in advance the maximum size of core files to infinite. To set the maximum size of the core file to infinite, either specify the option in the JavaVM start parameter in the simple setup definition file or execute shell commands.

Note that the core file size increases with the increase in the memory pool size specified in the JavaVM start parameter in the simple setup definition file, secure sufficient free disk space.

• Setting up the option in the JavaVM startup parameter in the Easy Setup definition file
  Define the JavaVM startup parameter in the <configuration> tag on a logical J2EE server (j2ee-server) in the Easy Setup definition file. The setting contents of a JavaVM startup parameter are as follows:
  

  <param-name> tag

  add.jvm.arg

  <param-value> tag

  -XX:+HitachiFullCore

  Setup example (For definition of the physical tier)

  <configuration> <logical-server-type>j2ee-server</logical-server-type> <param> <param-name>add.jvm.arg</param-name> <param-value>-XX:+HitachiFullCore</param-value> </param> : </configuration>

• To execute shell commands
  Execute the shell command and specify the maximum size of the core file as infinite.
  

  Execution example of Csh (C shell)

  limit coredumpsize unlimit

  Execution example of sh (standard shell)

  ulimit -c unlimited

Also, in addition to these settings, we recommend that you execute the shell commands to set the maximum file size to unlimited.

Example of execution for csh (C shell)

limit filesize unlimit

Example of execution for sh (standard shell)

ulimit -f unlimited

Reference note

Formula for estimating the core file size

The core file size, generated when a JavaVM process is down, is equal to the amount of virtual memory used. For details on the formula for the virtual memory usage, see the following manuals. The disk, which contains the current directory of the JavaVM process where the core file is generated, must always have free space greater than this core file size.

• For the J2EE application execution platform
  5.3 Estimating virtual memory usage in the uCosminexus Application Server System Design Guide
  
• For the batch application execution platform
  6.3 Estimating virtual memory usage in the uCosminexus Application Server System Design Guide
  

You can define the upper limit for the number of core files in the ejb.server.corefilenum parameter in the <configuration> tag of a logical J2EE server (j2ee-server) in the Easy Setup definition file. Define the ejb.server.corefilenum parameter in the extension parameter of the J2EE server.

If the total of core dump files output to working-directory/ejb/server-name/ while restarting the cjstartsv process exceeds the specified maximum number, the files are deleted in the order of output date, starting from the oldest file.