Red Hat SATELLITE 5.1.0 RELEASE NOTES Manual de instalación descargar pdf (Pagina 28)

10 The Virtualization Cookbook for Red Hat Enterprise Linux 5.2

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 hard-coded into REXX EXECs that adopt this convention. If you want a

different LPAR identifier character, they can easily be changed.

2.2.2 Backup file naming convention

It is recommended that you keep copies of important z/VM and Linux configuration files. You

should always keep copies of original configuration files in case you need to go back to 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 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. Often it is useful to retrieve in both

directions in case you “pass” the command that you are looking for. The default Linux shell,

bash, does this by default with 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 next to F12. Also, the

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

it is recommended that you assign it to F12.

2.3 Disk planning

There are different aspects to consider when planning how to choose and allocate disk

storage, including:

򐂰 Conventional ECKD DASD versus FBA disks over SCSI/FCP

򐂰 3390-3s versus 3390-9s or large disk support

򐂰 Amount of disk storage per Linux image and how to allocate file systems

Real address

LPAR identifier

DASD type - Minidisk or PERM space

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Red Hat SATELLITE 5.1.0 RELEASE NOTES Manual de instalación Pagina 28