10-10-2018
I have no experience with boot from SAN on metal, to put a small disclaimer upfront.
Not related to the problem...what would really help you is to have a separated installed operating system on both environments (DCs), with data part replicated in separate volume groups.
That way, only thing you do is import the volume group and (possibly or not depends) an ip assignment, depending on the topology and services such as vrrp or higher layer used.
I never endorsed SAN boot on metal personally (but in vms of course), always had couple of local disks to mirror ...
Point being, i would go with service separation and clean install on each of the sites, while cloning data part via storage methods.
Hopefully someone else who used linux SAN boot will be of more assistance with the actual problem.
Regards
Peasant.
This User Gave Thanks to Peasant For This Post:
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LEARN ABOUT FREEBSD
boot.config
BOOT.CONFIG(5) BSD File Formats Manual BOOT.CONFIG(5)
NAME
boot.config -- Configuration file for the boot blocks
DESCRIPTION
The boot.config file contains options for the FreeBSD boot block code.
When the FreeBSD boot loader runs, it searches the ``a'' slice of the boot partition for a boot.config file (as a result, slices which are
missing an ``a'' partition require user intervention during the boot process). If the boot.config file is found, its contents are used as
the default configuration options for the boot block code and are echoed to the system console.
A valid format of this file is to put BIOS drive number, a controller type, a unit number, a partition, a kernel file name, and any other
valid boot(8) option on a single line, as it is done at the ``boot:'' prompt.
The options related to the boot image selection described below and all the other options available for boot.config are documented in detail
in the boot(8) manual page.
FILES
/boot.config parameters for the boot blocks (optional)
EXAMPLES
The command:
# echo "-P" > /boot.config
will activate the serial console of FreeBSD.
The command:
# echo "1:ad(1,a)/boot/loader" > /boot.config
will instruct the second stage of boot(8) on the first disk to boot with the third boot(8) stage from the second disk.
The command:
# echo "1:ad(1,a)/boot/loader -P" > /boot.config
will do both of the above.
SEE ALSO
boot(8), loader(8)
AUTHORS
This manual page was written by Daniel Gerzo <danger@FreeBSD.org>.
BSD
May 13, 2007 BSD