SUMMARY: Boot/Root off 2nd hard disk

From: Steve Jukoff (
Date: Tue Jun 25 1991 - 23:06:14 CDT

Most people responded with the solution for booting off of
any disk but few provided the answer for *rooting* off of
an alternate disk. The answers are:

For booting:
               | | | |
               | | | ----- Partition number. 0=a, 1=b, ... 7=h
               | | ------- Drive/Device number. 0 for disk 0, 1 for disk 1...
               | --------- Controller number. 0 for built-in controller
               ----------- Device type. sd=scsi disk.

You can give these as parameters to the reboot command too.

For Rooting:
Change the kernel descriptions and make a new kernel, as follows:
in your kernel configuration file:
    config vmunix root on type 4.2 sd2a swap on type spec sd2b

then change the eeprom default boot device to "sd2()vmunix". build
a new kernel, install it on sd2a, and reboot

>b sd(0,2,0)vmunix -a
and you will be asked for various devices.

Thank to the following and others:
John DiMarco <>
Rick Dipper <>
R.Haigh <>
etnibsd!vsh@uunet.UU.NET (Steve Harris) (Kevin Zimmerman) (Liam Quin)
mikulska@ece.UCSD.EDU (Margaret Mikulska) (John M. Crowell)
"Charles A. Finnell" <>
thlcr!michel (Philippe Michel)
stern@sunne.East.Sun.COM (Hal Stern - Consultant)

Steven Jukoff DDN:
Phone: 415-780-5819 uucp: ...!ames!unet!jukoff

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