Red Hat SATELLITE 5.1.0 RELEASE NOTES Instrukcja Instalacji Pobierz pdf (Strona 72)

54 The Virtualization Cookbook for Red Hat Enterprise Linux 5.2

------ ------ ----

SUMMARY 3521K 12 1%

USABLE 3521K 12 1%

The output shows there are six paging volumes constituting 3521 KB pages, or about 14 GB

of page space (there are 4 KB per page).

4.7 Creating a user ID for common files

Now it is time to define your first z/VM user ID, LNXMAINT. It will be used to store files that will

be shared by Linux user IDs. Before starting, make a copy of the original USER DIRECT file:

==> copy user direct c = direorig = (oldd

4.7.1 Define the user in the USER DIRECT file

A small, 20-cylinder minidisk is allocated at virtual address 191. A larger, 300-cylinder

minidisk (approximately 225 MB), which is to be shared by many guests, is defined at virtual

address 192. Use the next free DASD designated as PERM space on your worksheet (2.7.2,

“z/VM DASD worksheet” on page 17). Cylinder 0 should always be reserved for the label;

therefore, you start minidisks at cylinder 1.

1. Edit the USER DIRECT file and add the following user ID definition to the bottom of the file:

==> x user direct c

====> bottom

====> a 6

...

USER LNXMAINT LNXMAINT 64M 128M BEG 1

INCLUDE TCPCMSU 2

LINK TCPMAINT 592 592 RR 3

MDISK 0191 3390 0001 0020 MMD857 MR READ WRITE MULTIPLE 4

MDISK 0192 3390 0021 0300 MMD857 MR ALL WRITE MULTIPLE 5

* 6

...

====> file

Note the following explanations:

1 User ID LNXMAINT, same password, default size of 64 MB, with class B, E and G

privileges

2 Include the profile named TCPCMSU (defined earlier in the USER DIRECT file)

3 Link to the TCPMAINT 592 disk read-only for access to FTP and other TCP/IP

commands.

4 Define a 191 minidisk of size 20 cylinders from volume MMD857.

5 Define 192 minidisk of size 300 cylinders (approximately 225 MB) from volume

MMD857 with the special read password of ALL, which allows read access from any

user ID without a disk password.

6 An empty comment line for better readability.

2. Whenever an MDISK statement is added or modified in the USER DIRECT file, always check

for overlapping cylinders and gaps. (Gaps will only leave empty disk space, but overlaps

can occur because unfortunately z/VM will allow you to define multiple minidisks over the

same disk space). You can perform this check by using the DISKMAP command:

==> diskmap user

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 267 268

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