Selectable Drive-Startup Sequence

Selectable drive startup (sometimes referred to as selectable boot) allows you to control the startup sequence of the drives in your server.  Each time you turn on the server, it checks the drives as it looks for the operating system.  The order in which the system checks the drives is the drive-startup sequence.

In most cases, you do not need to change the default drive-startup sequence.  However, if you set an administrator password (also known as a privileged-access password) or are working with multiple hard disk drives, multiple operating systems, different sized diskette drives, or a CD-ROM drive, you might want to change the default drive-startup sequence.

The default drive-startup sequence checks the primary diskette drive for a self-starting (bootable) diskette.  If one is present, the operating system or program is loaded from the diskette.  If not, the system checks the CD-ROM drive.  If a bootable CD is present it will be loaded. If not, the primary hard disk is checked for an operating system.  If one is present, it is loaded from that hard disk.

If you start the system from a diskette, the drive containing the diskette becomes drive A, regardless of the defined sequence, and the first hard disk selected in the startup sequence becomes drive C.  You can choose a startup sequence of up to four drives.
   You can customize the startup sequence by changing the order in which the system checks the drives.  You decide which four drives are the first to be checked, and the order in which the system checks them.

Note:  When you change the startup sequence, the drive letters also might change. The operating system assigns the drive letters when the system starts. Letters A and B always are assigned to diskette drives. Also, if a CD-ROM drive has a startable (bootable) CD mounted at startup time, the system views the CD-ROM drive as a diskette drive and assigns it drive letter A or B. Subsequent drive letters can be assigned to any type of drive, based on the operating system or the device drivers used.

Warning: If you changed your startup sequence, you must be extremely careful when doing write operations (for example, copying, saving, or formatting). You can accidentally overwrite data or programs if you select the wrong drive.

To change the startup sequence:
 1. Turn on the system and when the F1 prompt appears on the screen, press F1.  The system programs Main Menu appears.
    Note:  For disk-array models, insert the Reference Diskette into the primary diskette drive, then turn on the system. Or, if the system is turned on already, insert the Reference Diskette and press Ctrl+Alt+Del.
 2. Select Set features from the Main Menu.
 3. Select Set startup sequence and follow the instructions on the screen.

Nice Graphic

    To make a change, use the Up Arrow key or the Down Arrow key to highlight one of the bracketed items.  Use F5 and F6 to scroll through the list of available choices.   When you are finished with your changes, press F10 to save them.  If the same drive is selected twice in the sequence, an asterisk appears next to the second occurrence to indicate a conflict.  You must resolve all conflicts before you can save the changed sequence.
    Note:  As with all procedures that change the configuration, you should back up the System Partition (for non-array models).  For disk-array models, which do not have a System Partition, the updated configuration information is saved to your Reference Diskette.

Example:  Default Startup Sequence
This example shows the default startup sequence when one hard disk is installed.

Startup Number          Device
1............[2.88MB 3.5-inch diskette drive 0]
2............[SCSI ROM Device slot 1 Bus 0 (ID,LUN)..:6,0]
3............[Not selected]
4............[Not selected]

Note:  The number of selections and device types you see on this screen varies with the number and types of devices installed.

System Programs

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