02-01-2010
Reliable dual-boot method for 5.3 and 6.1
Hi All,
I am looking for information and advice on a reliable method to support the dual booting between AIX 5.3 and AIX 6.1
I have a 7029-6E3 with 2 x 36Gb disks, hdisk0 (altinst_rootvg) and hdisk1 (rootvg)
I have previously used alt_disk_install to upgrade from 5.1->5.3, and now from 5.3 -> 6.1, so I can currently boot off 6.1/hdisk1, but when I try "alt_rootvg_op -W -d hdisk0" to wake up 5.3 and reboot, then the LCD display shows "cannot mount rootvg" or something similar.
I can then reboot to CD (bootlist = cd0,hdisk0), and through maintenance shell set bootlist back to cd0,hdisk1 to get back into 6.1
I have full system backups of the rootvg in 5.3 mode and also 6.1 mode (these were made while each o/s version was stable, immediately before and after the upgrade process).
So, can anyone tell me how to setup a proper dual boot machine where each rootvg is on a separate hdisk, and therefore doesn't interefere with the other. Most Google hists on "aix dualboot" relate to upgrade processing and the use of alt_disk_install...
Thanks in advance
Kevin
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LEARN ABOUT NETBSD
kloader
KLOADER(4) BSD Kernel Interfaces Manual KLOADER(4)
NAME
kloader -- in-kernel bootloader
SYNOPSIS
options KLOADER
options KLOADER_KERNEL_PATH=""/netbsd""
DESCRIPTION
The kloader is the in-kernel bootloader for platforms that do not have a proper firmware.
Some platforms supported by NetBSD do not have a firmware that can boot the NetBSD kernel. Examples are game consoles (dreamcast port), and
handhelds (hpcarm, hpcmips, and hpcsh ports). On such platforms the bootloader is usually a host program that runs under the native OS.
This means that rebooting NetBSD is a lengthy process of booting into the native OS first, launching the bootloader program, and finally
booting NetBSD again. This problem is addressed by kloader, which allows the currently running kernel to serve as a bootloader for the ker-
nel being booted, thus avoiding the burden of booting into the native OS first.
When kloader is configured into the kernel, a call to reboot(2) causes the kloader to load the new kernel into memory, and arrange for con-
trol to be passed to the new kernel -- just like a standalone bootloader does. The new kernel then boots in the ordinary manner.
SEE ALSO
reboot(2), boot(8), reboot(8)
HISTORY
kloader first appeared in NetBSD 1.6.
BUGS
kloader ignores howto and bootstr arguments passed to the reboot(2) system call, and reboots the system with the previous boot settings.
kloader doesn't support booting compressed kernels.
The hpcarm port doesn't support kloader yet.
BSD
April 3, 2004 BSD