User`s guide

3-24 AlphaServer DS20 User’s Guide
3.9 Switching Between Operating Systems
The system supports the use of multiple operating systems on different system
and data disks not in the machine at the same time; that is you can have a set of
disks for each operating system.
CAUTION: This operation is not for the faint hearted especially if you have a
shadow system disk and shadow arrays. The file structures of the three
operating systems are incompatible. Therefore all disks used by one
operating system must be removed when another is put in its place.
Upon reinstallation all disks must be placed in the same physical
locations. It is therefore necessary to keep track of the location of each
disk in the system.
3.9.1 Switching to Windows NT
Use the following procedure.
1. Shut down the operating system and power off the system.
2. Remove and mark the physical location of each disk in the system.
3. Either place blank disks or your Windows NT disk set into the system. (If you
are placing a Windows NT disk set into the system, be sure that each disk is
replaced in the same physical location from which it was removed.)
4. Power on the system.
5. Enter the following commands at the SRM console prompt:
P00>>> set os_type nt
P00>>> init
6. Either install Windows NT, see Section 3.8, or at the AlphaBIOS boot screen,
start AlphaBIOS setup (F2), select CMOS Setup, and press Enter.
7. Set the system date and time.
8. In CMOS Setup, check that the setup for the floppy and other basic parameters
are accurate. Set system-specific parameters, such as the memory test and
password, in Advanced CMOS Setup as needed. Press F10 to save the changes.
9. From the AlphaBIOS Setup screen select Utilities. In the selection box, choose
OS Selection Setup. Make sure the selections (boot name, boot file, and so on)
are what you want. Press F10 to save the changes.
10. Return to the boot screen and boot Windows NT.