Perform the following steps to activate the HFS file system for the first time.

1. Set up a root file system by putting the following statement in BPXPRMxx.

   ROOT  FILESYSTEM ('OMVS.ROOT')
         TYPE HFS
         MODE(RDWR)  

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2. Create a temporary BPXPRMtt member that has the following statement.

   FILESYSTYPE TYPE(HFS) ENTRYPOINT(GFUAINIT)

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3. Dynamically add the statements to BPXPRMtt.

   SETOMVS RESET=(tt)

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4. From TSO or the ISHELL, do the following:
   1. Unmount the current root file system.
   2. Mount the root data set as the new root file system.
   3. Mount any additional HFS data sets as needed.

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5. Add the following statements to the BPXPRMxx member that is used on IPL:
   1. The FILESYSTYPE statement used in Step 2.
   2. A ROOT statement for the root file system.
   3. MOUNT statements for the additional mounts that should be done initially.

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When you are done, you have activated the HFS file system for the first time.