System Startup, Configuration, and Shutdown Reference Manual (32650-90907)

Chapter 3

System Startup Functions

Starting the System

This section discusses using the initial system loader utility, START, that activates the operating system.

START is the ISL utility used most often, whether to boot the system from disk after a reset, to automatically

reboot after the completion of the UPDATE, INSTALL, or DUMP utility, or to bring up the operating system after a

shutdown.

START execution differs depending on the previously executed boot command. For example, a START after an

INSTALL executes differently than a START after a shutdown or reset. START after an INSTALL may initialize

the system member volumes. A START option after an INSTALL or UPDATE does not restart jobs.

There are, primarily, six load and start utilities for the operating system.

• START or START RECOVERY

• START NORECOVERY

• UPDATE or UPDATE NOCONFIG

• UPDATE CONFIG

• INSTALL

• DUMP

Using START and its Options

The ISL command for the START utility is START. The utility has several options:

START [;GROUP=cgn][;LOGON=acct] [{ ;RECOVERY

;NORECOVERY }]

[{ ;SINGLE-DISC [{ ;SINGLE-USER

;MULTI-DISC }] ;MULTI-USER }]

[{ ;SYSSTART

;NOSYSSTART }]

Specify START alone or with alternate options. Separate the options from the command and other options with

a blank or semicolon.

Using the ISL START command without listing any options:

ISL> START

is the same as specifying the following default options:

ISL> START GROUP=bootup LOGON=OPERATOR.SYS RECOVERY&

MULTI-USER MULTI-DISC SYSSTART

NOTE bootup contains the CONFIG file that was used by the previous START NORECOVERY command.

RECOVERY starts the system, but sets the fence at 14 which prevents any jobs or sessions from

automatically starting.