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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GRUB(8) FSF GRUB(8)
NAME
grub - the grub shell
SYNOPSIS
grub [OPTION]...
DESCRIPTION
Enter the GRand Unified Bootloader command shell.
--batch
turn on batch mode for non-interactive use
--boot-drive=DRIVE
specify stage2 boot_drive [default=0x0]
--config-file=FILE
specify stage2 config_file [default=/boot/grub/menu.lst]
--device-map=FILE
use the device map file FILE
--help display this message and exit
--hold wait until a debugger will attach
--install-partition=PAR
specify stage2 install_partition [default=0x20000]
--no-config-file
do not use the config file
--no-curses
do not use curses
--no-floppy
do not probe any floppy drive
--no-pager
do not use internal pager
--preset-menu
use the preset menu
--probe-second-floppy
probe the second floppy drive
--read-only
do not write anything to devices
--verbose
print verbose messages
--version
print version information and exit
REPORTING BUGS
Report bugs to <bug-grub@gnu.org>.
SEE ALSO
update-grub(8), grub-install(8).
The full documentation for grub is maintained as a Texinfo manual in the grub-legacy-doc package. If the info and grub programs are prop-
erly installed at your site, the command
info grub
should give you access to the complete manual.
grub (GNU GRUB 0.97) January 2013 GRUB(8)