The Virtualization Cookbook for SLES 10 SP2 - z/VM - IBM

==> x user direct c
====> bottom
====> a 9
...
*------------------------------------------------------------
* z/VM system user IDs are above, local user IDs are below
*------------------------------------------------------------
USER LNXMAINT LNXMAINT 64M 128M BEG 1
INCLUDE TCPCMSU 2
LINK TCPMAINT 592 592 RR 3
MDISK 0191 3390 0001 0020 UM6289 MR READ WRITE MULTIPLE 4
MDISK 0192 3390 0021 0300 UM6289 MR ALL WRITE MULTIPLE 5
* 6
...
====> file
Note the following points for the numbers in black:
1 User ID LNXMAINT, same password, default size of 64MB, 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 UM6289
5 Define 192 minidisk of size 300 cylinders (approximately 225MB) from volume
UM6289 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.
► Whenever an MDISK statement is added or modified in the USER DIRECT file you should
always check for overlapping cylinders and gaps (gaps will only leave empty disk space,
however, overlaps can occur because z/VM will allow you to shoot yourself in the foot by
defining multiple minidisks over the same disk space). This is done with the DISKMAP
command:
==> diskmap user
The minidisks with the END option specified in this directory will not be includ
ed in the following DISKMAP file.
File USER DISKMAP A has been created.
► The file created, USER DISKMAP, contains a mapping of all minidisk volumes defined in the
USER DIRECT file. It will list any overlaps or gaps found on the volumes. Edit the file and
turn off the prefix area with the XEDIT PREFIX OFF subcommand to view 80 columns:
==> x user diskmap
====> prefix off
► Search for the text overlap with the / subcommand:
====> /overlap
You should see the error message: DMSXDC546E Target not found. This means that no
minidisks are overlapping each other.
Now search for all the gaps using the ALL subcommand. You should also see some gaps:
====> all /gap
0 500 501 GAP
-------------------- 6 line(s) not displayed --------------------
0 0 1 GAP
56 The Virtualization Cookbook for RHEL 6