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 CENTOS
grub-reboot
GRUB-REBOOT(8) System Administration Utilities GRUB-REBOOT(8)
NAME
grub-reboot - set the default boot entry for GRUB, for the next boot only
SYNOPSIS
grub-reboot [OPTION] MENU_ENTRY
DESCRIPTION
Set the default boot menu entry for GRUB, for the next boot only.
-h, --help
print this message and exit
-V, --version
print the version information and exit
--boot-directory=DIR
expect GRUB images under the directory DIR/grub instead of the /boot/grub directory
MENU_ENTRY is a number, a menu item title or a menu item identifier. Please note that menu items in submenus or sub-submenus require speci-
fying the submenu components and then the menu item component. The titles should be separated using the greater-than character (>) with no
extra spaces. Depending on your shell some characters including > may need escaping. More information about this is available in the GRUB
Manual in the section about the 'default' command.
REPORTING BUGS
Report bugs to <bug-grub@gnu.org>.
SEE ALSO
grub-set-default(8), grub-editenv(1)
The full documentation for grub-reboot is maintained as a Texinfo manual. If the info and grub-reboot programs are properly installed at
your site, the command
info grub-reboot
should give you access to the complete manual.
grub-reboot (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-REBOOT(8)