Steps to increase zFS File System size dynamically in the WebSphere Application Server (WAS) on zOS

The 'zFS' stands for zSeries File System. It's newest Portable Operating System Interface (POSIX)-style hierarchical file system for IBM's z/OS operating system. The zFS as a separate entity was initially released as PTFs (patches) for z/OS 1.2.
But now the zFS is included as a standard feature beginning with z/OS 1.3.

Step 01) Go to bin directory of WebSphere Application Server(WAS) base installation
Look for 'zCreateConfigFileSystem.sh' script at given locations-

/WAS800/zWebSphere/V8R0/bin  (For WAS8)
/WAS850/zWebSphere/V8R5/bin  (For WAS8.5)

Step 02) Edit 'zCreateConfigFileSystem.sh' script
Add EXTADDR parameter in the script as shown below in the red colour-

# ZFS configuation file system requested
else
        # Define vsam linear data set
        printMessage CWLCS0023I "$fileSystemName"
        if [[ -z "$volume" ]]; then
                zfsadm define -aggregate "$fileSystemName" -cylinders "$primaryCylinders" "$secondaryCylinders" -dataclass EXTADDR
        else
                zfsadm define -aggregate "$fileSystemName" -volumes "$volume" -cylinders "$primaryCylinders" "$secondaryCylinders" -dataclass EXTADDR
        fi

Step 03) Save the script file.
Now whenever ZFS File System will fall short of size, it will dynamically grow in size to to accommodate as per the new requirements.

WAS 8.5 and Liberty Profile

What is WAS 8.5?

• It is a proven, high-performance transaction engine that can help to build, run, integrate, and manage dynamic business applications. 
• It introduces the concept of dynamically adding applications  
• It does not requires server re-start after adding any applications on Liberty profile

What is new in WAS 8.5?

• New Liberty profile: a lightweight application foundation
• Fast, flexible, and simplified application development
• Intelligent Management and enhanced resiliency 
• Integrated tools 
• Improved operations, security, control, and integration 

Why Liberty on z/OS? 

• Improved performance  
• It is included with all the commercial editions of WAS 8.5 server 
• It provides a lightweight profile of the server for web, mobile and OSGi applications
• It is a functional subset of the full profile of WebSphere Application Server, for both development and production use
• Install size of under 50 MB, a start up time of around 03 seconds and a new XML-based server configuration

Liberty Profile Installation
   There 02 ways to install Liberty profile-
     1) Unzip jar file ‘wlp-developers-8.5.0.0.jar’
     It creates following directories-
     bin, clients, dev, lafiles, lib, templates, usr   

    2) Install Eclipse Java EE IDE for Web Developers (Indigo Service Release 2).
    Select the install icon for WAS V8.5 Liberty Profile. 
   https://www.ibm.com/developerworks/mydeveloperworks/blogs/wasdev/entry/download_wlp?lang=en
   Drag it onto the menu bar in Eclipse IDE(Integrated Development Environment). 
   And then follow the prompts.

Install directory created for Liberty  Profile

 'Usr' directory contains server instances with their configuration and applications

Liberty Profile Architecture 

Deploy Applications on Liberty

• Drop new application into dropins directory, the application is automatically deployed on the server 
• Location of dropins directory: wlp/usr/servers/server1/dropins

Liberty Profile Commands

    1) To create new Liberty server
    bin> server.bat create <serverName> (windows)
    bin> server create <serverName> (other Platform) 
   
    2) To start Liberty server  
    bin> server.bat start <serverName> (windows)
    bin> server start <serverName> (other Platform)
 
   3) To stop Liberty server
   bin> server.bat stop <serverName> (windows)
   bin> server stop <serverName> (other Platform)  
NOTE: Commands may slightly differ for different Operating Systems.
The user needs to set JAVA_HOME & PATH pointing to JDK install path.

Features of Liberty Profile 

1. Unlike traditional WAS on z/OS, the Liberty Profile server instance is a single JVM rather than the multiple JVM model used by traditional WAS on z/OS. 
2. Configuration of Liberty Profile server instances is done by editing the 'server.xml' file and a small set of other optional files.
3. There is no "Administrative Console" for Liberty Profile.
4. The Liberty Profile is designed to be composable, lightweight, dynamic and fast.
5. Liberty Profile does not support EJB (Enterprise JavaBeans) applications at this point of time. 
6. It only supports JEE Web modules and Enterprise applications.
7. To install an application on Liberty profile, just place your application file into the dropins directory. 
   
8. Liberty profile kernel will identify application files placed in the dropins directory to install them.