DEC 4000 600 series, Owner'S Manual, Page: 88 / 242

Setting Boot Flags (boot_osflags)
Setting Boot Flags (boot_osflags)
What Are Boot
Flags? Boot flags contain information that is read and used by the
operating system during a system bootstrap procedure.
Boot flags may be passed to the operating system either on the
boot command line with the -flags option (see boot in Chapter 3)
or by setting the boot_osflags environment variable as described
in this section. The default boot flag setting is null.
The interpretation of the boot flags is operating system
dependent.
Boot Flags
Settings for
OpenVMS AXP
Systems The OpenVMS AXP operating system takes two boot flag
arguments:
• root number
• boot flags
If the boot_osflags environment variable is given or has been set
to only one argument, the argument designates the boot flag and
not the root number.
Root Number Settings
The root number is the directory number on the system disk on
which OpenVMS AXP files are located.
For instance:
If OpenVMS AXP
files are located
on . . .
The root number
for the system is . . .
[SYS0.SYSEXE] 0 (default)
[SYS1.SYSEXE] 1
[SYS2.SYSEXE] 2
[SYS3.SYSEXE] 3
If your files are located on the default disk, [SYS0.SYSEXE] you
do not need to specify the root number.
4–10 Setting Environment Variables