ROOT

The ROOT statement defines and mounts the root file system. The root file system can be either HFS and zFS. The zFS file system is the preferred file system, and continued use of HFS is not encouraged.

You can use multiple MKDIR keywords on the ROOT statement to define mount points in BPXPRMxx so that one or more directories is created in the mounted file system during z/OS UNIX initialization.

Restriction: MKDIR is intended to run during synchronous mounts on the system that is initializing. The directory might not be created if any of these situations exist:

The file system is mounted asynchronously, such as with NFS.
The SYSNAME value identifies a remote system.
The file system is already mounted on a remote system.

Tip: To ensure that mounts succeed, use SETOMVS SYNTAXCHECK to check the MVS™ catalog for the existence of the HFS or zFS file system names listed on each MOUNT statement.