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

The LPAR used in this book is identified by the character M. The following characters are

used for the types of DASD in the second character of the label:

M Minidisk space (PERM)

P Paging space (PAGE)

S Spool space (SPOL)

T Temporary disk space (TDISK)

V z/VM operating system volumes

For example, Figure 2-1 shows the labeling convention for the DASD in LPAR

M, of type

minidisk at real address A700.

Figure 2-1 DASD labeling convention

The letter M is hardcoded into REXX EXECs that adopt this convention. If you want a

different LPAR identifier character, they can easily be changed (search for the firstChar

variable).

2.2.2 Backup file naming convention

Keep copies of important z/VM and Linux configuration files. You should always keep copies

of original configuration files in case you need to restore from them. Because z/VM file names

are limited to 16 characters (eight for the file name and eight for the file type), only the last

four characters of the file type are used. This situation often requires some characters to be

overwritten. For the original file, the suffix ORIG is used, and for the most recent working copy,

the suffix WRKS (for “it WoRKS”!) is used. For example, the original USER DIRECT file is copied

to the file USER DIREORIG before it is modified the first time.

2.2.3 The command retrieve convention

The ability to retrieve past commands is a common tool. The default Linux shell, bash, allows

you to scroll through past commands by using the up arrow and down arrow keys.

There is a convention in z/VM to use the F12 function key (labeled PF12 on physical 3270

devices) to retrieve the last command, although it is not defined to all user IDs. There is no

convention retrieve commands in the other direction, but it is possible to set another key to

that function. Therefore, F11 is used to retrieve forward, because it is right next to F12. Also,

the same function is useful in the editor, XEDIT. The ? subcommand retrieves past

commands, so you should assign it to F12.

Real address

LPAR identifier

DASD type - Minidisk or PERM space

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Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Pagina 30