Specifications

Chapter 4. z/VM notes 59
Figure 4-4 Logon to MAINT
In a large production operation, MAINT would be used sparingly.
6
In our small sandbox z/VM
systems, we use MAINT frequently. Among other things, MAINT can edit the z/VM directory
and activate a new copy. The directory is where z/VM users are defined, along with details of
each user’s virtual machine. An example of directory updating is presented later.
Note that the terms z/VM users, userids, and virtual machines are used interchangeably.
4.4 Minidisks and files
z/VM works with three types of disk volumes:
򐂰 CP-owned volumes. These contain the minidisks needed to run z/VM, or contain paging
space, spool space, or temporary space. They may also contain user minidisks.
򐂰 User-owned volumes. These typically contain minidisks but not those used by the
operating system.
򐂰 Other disks. These can be used as standard (non z/VM) volumes or as whole-pack
minidisks. The z/OS volumes we sometimes use under z/VM are normally defined as
whole-pack minidisks. The whole-volume minidisk concept is needed for sharing volumes
among multiple z/VM virtual machines, such as multiple z/OS systems.
6
MAINT is quite similar to IBMUSER in an initial z/OS installation and is somewhat like root in a Linux system. These
user IDs have all the necessary authority to further customize and manage the systems. In production operations,
various authorities are delegated to other user IDs, and the MAINT and IBMUSER IDs are seldom used. In small
sandbox systems, MAINT, IBMUSER, and root are often directly used, even when not strictly necessary.
LOGON MAINT
z/VM Version 6 Release 2.0, Service Level 1201 (64-bit),
built on IBM Virtualization Technology
There is no logmsg data
FILES: 0013 RDR, NO PRT, NO PUN
LOGON AT 10:15:22 EST TUESDAY 03/05/13
z/VM V6.2.0 2012-09-29 23:41
DMSACP723I B (5E5) R/O
DMSACP723I D (51D) R/O
DMSACP723I E (551) R/O
******************************************************************
THE MAINT620 USER ID **MUST** BE USED INSTEAD OF MAINT
WHEN INSTALLING SERVICE.
******************************************************************
PRESS ENTER TO CONTINUE
Ready; T=0.03/0.06 10:15:42
RUNNING SSI1