Address UNIX System Services (USS) Requirements
Address UNIX System Services (USS) Requirements
The Zowe z/OS component runtime requires USS to be configured. As shown in the Zowe architecture, a number of servers run under UNIX System Services (USS) on z/OS. Review this topic for knowledge and considerations about USS when you install and configure Zowe.
- What is USS?
- Setting up USS for the first time
- Language environment
- OMVS segment
- Address space region size
- Temporary files management
What is USS?
The UNIX System Services element of z/OS® is a UNIX operating environment, which is implemented within the z/OS operating system. It is also known as z/OS UNIX. z/OS UNIX files are organized in a hierarchy, as in a UNIX system. All files are members of a directory, and each directory in turn is a member of another directory at a higher level in the hierarchy. The highest level of the hierarchy is the root directory. The z/OS UNIX files system is also known as zFS.
For more information on USS, see the following resources:
- Introduction to z/OS UNIX for z/OS 2.2
- Introduction to z/OS UNIX for z/OS 2.3
- Introduction to z/OS UNIX for z/OS 2.4
Setting up USS for the first time
If you have not enabled USS for your z/OS environment before, the SMP/E distribution of Zowe provides a number of JCL jobs to assist with this purpose. You can consult with your USS administrator if you need more information such as the USS file system.
Language environment
To ensure that Zowe has enough memory, the recommended HEAP64 site should be large enough.
HEAP64(4M,4M,KEEP,1M,1M,KEEP,0K,0K,FREE)
OMVS segment
Users who install Zowe to run Zowe scripts need to have an OMVS segment. If the user profile doesn't have OMVS segment, the following situations might occur:
-
When you access USS through TSO OMVS, you will see the following message:
FSUM2057I No session was started. This TSO/E user ID does not have access to OpenMVS.+
FSUM2058I Function = sigprocmask, return value = FFFFFFFF, return code = 0000009C, reason code = 0B0C00FB
Action: Create an OMVS segment with a UID. -
When you access USS through SSH, you will see the following message:
Access denied with SSH