Summary of various file systems in a shared environment
This topic introduces the various file systems and terms needed
to use the shared file system support. Table 1 summarizes
the file systems that are needed in a sysplex environment. As you
study the illustrations of file system configurations, you can refer
back to this table.
| Name | Characteristics | Purpose | How created |
|---|---|---|---|
| Sysplex root | The sysplex root contains directories and symbolic links that allow redirection of directories. Only one sysplex root file system is allowed for all systems participating in a shared file system. | The sysplex root is used by the system to redirect addressing to other directories. It is very small and is mounted read-only. | For the zFS file system, the user runs the BPXISYZR job. For the HFS file system, the user runs the BPXISYSR job. |
| System specific | The system-specific file system contains data that is specific to
each system, including the /dev,/tmp,
/var, and /etc directories for one system. There is one
system-specific file system for each system that is participating in a shared file system. If you are using the TSO/E MOUNT command to set up system-specific file systems, specify the UNMOUNT parameter. Then, if data sets are replaced during a reIPL, the new data sets are mounted as the original file systems. Use the NORWSHARE mount parameter to mount zFS system-specific file systems. |
The system-specific file system is used by the system to mount system-specific data. It contains the necessary mount points for system-specific data and the symbolic links to access sysplex-wide data. | For the zFS file system, the user runs the BPXISYZS job on each participating system. For the HFS file system, the user runs the BPXISYSS job on each participating system. |
| Version In a sysplex, the version file system is the new name for the root file system. |
The version file system contains system code and binary files, including the /bin,/usr, /lib, /opt, and /samples directories. IBM® delivers only one version file system; you might define more as you add new system levels and new maintenance levels. | The version file system has the same purpose as the root file system in the non-sysplex world. It must be mounted read-only. See Mounting the version file system for a complete description of the version file system. | IBM supplies this file system in the ServerPac. CBPDO users create the file system by following steps that are defined in the Program Directory. |