In a VM environment, you can maintain the OpenExtensions VM Database information in the VM directory or with an External Security Manager (ESM) such as CA ACF2 for VM. The POSIXDB option in the OPTS VMO record identifies whether CA ACF2 for VM activates OpenExtensions VM Database support. See the “Defining Structured Infostorage Records” chapter for the syntax and more information on the OPTS VMO record.
If you specify POSIXDB, CA ACF2 for VM informs VM that it is maintaining the OpenExtensions VM Databases. If this option is on, CA ACF2 for VM responds to the DIAGA0 subcode X'08' and takes over OpenExtensions VM Database management. To activate CA ACF2 for VM OpenExtensions VM Database support, you must have the appropriate PROFILE records written, the OPTS VMO POSIXDB option set, and you must IPL VM.
If you specify NOPOSIXDB (the default), CA ACF2 for VM stays out of the POSIXDB business and responds negatively to the DIAGA0 subcode X'08'.
MAXPGRPS tells CP what the maximum number of POSIX groups you are allowing. Be conservative in your estimate because CP allocates storage based on this number for every user that logs on to VM. MAXPGRPS has a minimum value of 32 and a maximum value of 125. The following example illustrates how to set POSIXDB and MAXPGRPS:
SET CONTROL(VMO) CHANGE OPTS POSIXDB MAXPGRPS(32)
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