Mounting the root file system in read-only mode

After you perform the actions in Table 1, update the BPXPRMxx member of SYS1.PARMLIB as follows:

ROOT FILESYSTEM('OMVS.ROOT')         /* Root file system        */
         TYPE(ZFS)                   /* File system type ZFS    */
         MODE(READ)                  /* Mounted for read        */

With the root file system mounted in read-only mode, you must define other BPXPRMxx parameters for the directories that remain read/write.

Example: You might also have the following BPXPRMxx entry for /etc:

MOUNT FILESYSTEM('OMVS.ETC')         /* The /etc file system         */
      MOUNTPOINT('/etc')             /* Mount at /etc file system    */
         TYPE(ZFS)                   /* File system type ZFS         */
         MODE(RDWR)                  /* Mounted for read/write       */