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66 z/VM and Linux on IBM System z: The Virtualization Cookbook for Red Hat Enterprise Linux 6.0

Note that this XEDIT macro will only work on a vanilla USER DIRECT file because it searches

for the original user IDs next to passwords. If you want to change your password again, it

should be much easier because you can use the XEDIT CHANGE subcommand. For

example, to change all passwords from lnx4vm to vm4lnx, invoke the following commands:

==> x user direct c

====> c/LNX4VM/VM4LNX/* *

DMSXCG517I 798 occurrence(s) changed on 345 line(s)

Congratulations, your z/VM system is now customized and ready for Linux.

4.10 Backing up your z/VM system to tape

Your system is now customized with a running TCP/IP stack, a highly available

VSWITCH, a startup and shutdown process, and with a user ID for shared files. You have

changed the passwords. This would be a good time to back up the system to tape.

There are five system volumes that should be backed up, 610RES, 610SPL, 610PAG,

610W01, and 610W02 (or just the first three if you are using 3390-9s). If you changed the

labels of the last four at install time, then use those labels. You have also configured a sixth

volume that is important to Linux: that is, the first 320 cylinders of the volume with LNXMAINT

on it.

To back up these volumes to tape, refer to Chapter 8, “Load the System Image, Step 11.

Store a Backup Copy of the z/VM System on Tape” in The z/VM Guide for Automated

Installation and Service, GC204-6099.

4.11 Relabeling system volumes

In previous books, the z/VM installation was described using “standard labels” on the

CP-owned volumes (for example, 610RES, 610SPL, 610PAG, 610W01, and 610W02). In this

book, changing the last four labels to include the real device address in the last four

characters of each label is recommended (the label of the “res pack”, for example 610RES,

cannot be modified at install time). This alleviates the possibility that another vanilla z/VM

system with the same labels is installed onto volumes accessible by your z/VM system. If that

happens, it is likely that one of the systems will not IPL correctly.

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Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Pagina 86