6-52 Compaq AlphaServer ES40 Service Guide
6.11.2 Switching from Windows NT to UNIX or OpenVMS
Follow this procedure if you have already installed Windows NT and
want to switch to UNIX or OpenVMS.
CAUTION: Before switching operating systems, make a note of the boot path
and location of the system disk (controller, SCSI ID number, and so
on) of the operating system you are removing so that you can restore
that operating system at a later date.
1.
Shut down the operating system and power off the system. Unplug the
power cord from each power supply.
2.
Remove the enclosure panels and system covers as described in Chapter 8.
3.
Remove any options that are not supported on Tru64 UNIX or OpenVMS
and replace them with supported options.
4.
Remove the Windows NT system disk and insert the UNIX or OpenVMS
system disk.
5.
Plug in the power supplies and power up the system.
6.
In AlphaBIOS, access the Advanced CMOS Setup screen and change the
Console Selection to UNIX console (SRM) or OpenVMS Console (SRM), as
appropriate. Press F10 to save the change. This menu selection changes
the setting of the os_type environment variable so that the SRM console is
loaded the next time you reset your system.
7.
Press the Reset button to reset the system.
8.
In the SRM console, restore the boot parameters you saved previously for
UNIX or OpenVMS.
9.
Boot the UNIX or OpenVMS operating system.
10.
Set the system date and time.
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