mon_fsstatd – Monitor z/VM guest file system size

6.10 z/VM guest

The mon_fsstatd command is a user space daemon that collects physical file system size data from Linux® on z/VM®.

The daemon periodically writes the data as defined records to the z/VM monitor stream using the monwriter character device driver.

You can start the daemon with the systemd service unit mon_fsstatd. When the daemon is started as a service unit, it reads the configuration file /etc/sysconfig/mon_fsstatd.

Before you begin:
  • Install the monwriter device driver and set up z/VM to start the collection of monitor sample data.
  • Customize the configuration file /etc/sysconfig/mon_fsstatd if you plan to call it as a systemd service.

The following publications provide general information about DCSSs, DIAG x'DC', CP commands, and APPLDATA:

  • See z/VM: Saved Segments Planning and Administration, SC24-6322 for general information about DCSSs.
  • See z/VM: CP Programming Services, SC24-6272 for information about the DIAG x'DC' instruction.
  • See z/VM: CP Commands and Utilities Reference, SC24-6268 for information about the CP commands.
  • See z/VM: Performance, SC24-6301 for information about monitor APPLDATA.

You can run the mon_fsstatd command in two ways.

  • Calling mon_fsstatd as a systemd service, if systemd is provided by your distribution. This method reads the configuration file /etc/sysconfig/mon_fsstatd.
  • Calling mon_fsstatd manually from a command line.