IBM ZVM - FOR LINUX V6 RELEASE 1, Getting Started

Page: 56 / 172

v
The Clear_TDisk feature causes CP to erase temporary disks fully (that is,
overwrite the entire temporary disk with zeros) after those disks are detached.
The feature prevents another user who may define an identically sized
temporary disk from accessing data written by the previous user.
v
The Retrieve defines the default and maximum number of retrieve buffers
allowed per user on your system. Retrieve buffers create a command history,
from which users can retrieve commands previously issued. Command retrieval
is usually assigned to a program function key such as PF12 (F12). The
assignment is through the CP SET command, SET PF12 RETRIEVE. By pressing
PF12, a command is retrieved and written back into the command area on the
terminal screen. You probably do not need to change these settings.
v
The Passwords_on_Cmds feature tells CP whether to prompt users for
passwords when using the CP AUTOLOG, LINK, or LOGON commands.
v
The Disconnect_timeout feature controls whether and when a virtual machine is
logged off after it has been forced to disconnect. You will turn this feature off, so
that any virtual machine that has been forced to disconnect will not be logged
off.
v
The ShutdownTime and Signal ShutdownTime features enable a virtual machine
to register with CP to receive a shutdown signal when z/VM is shutting down
(see “Steps for enabling Linux virtual servers to shut down automatically” on
page 87). CP waits to shut itself down until the time interval (in seconds) is
exceeded, or all of the virtual machines enabled for the signal shutdown have
reported a successful shutdown. Some Linux distributions support this function,
which allows Linux to shut down cleanly before z/VM shuts down.
Before you begin: You need to end CP’s access to the primary parm disk. See
“Steps for releasing the primary parm disk” on page 37.
Perform these steps to update the FEATURES statement:
1.
Edit the SYSTEM CONFIG Z file. Type this command and press the Enter key:
xedit system config z
2.
Find the line containing the text “Set_Privclass” in the section titled “Features
Statement.” At the XEDIT command line, type this command and press the
Enter key:
====> /set_privclass
3.
At the command line, type this command and press the Enter key:
====> i
4.
Type this line (indent three spaces), then press the Enter key twice:
Enable ,
You might also change the comments for “Auto_Warm_IPL” and
“Clear_TDisk”.
5.
Under “Passwords_on_Cmds ,”:
a. Change the three instances of “yes” to “no”. You might also want to
change the comments for these lines to reflect your change.
42
z/VM: Getting Started with Linux on System z