SMF type 30 records provide a summary of the I/O activity done
using z/OS® UNIX. The I/O activity is summarized in the
following categories:
- I/O activity to regular files. This includes all I/O to file systems.
- I/O activity to pipe files. Although there is no physical I/O
associated with pipes, this activity is still listed as I/O. This
field contains I/O activity to pipe files and to UNIX domain sockets.
- I/O activity to special files. This includes I/O activity to terminals.
- I/O activity to network sockets. This field includes I/O activity
to network sockets as returned by the TCP/IP physical file system.
Note: - These values may contain zeros if your TCP/IP physical file system
does not support address space level accounting.
- Different TCP/IP physical file systems may account differently
for the same network activity.