07-05-2006
You wnat a backup ? rsync is fine no need for cp. exspecial not on the disklevel since this is a real problem when the disk are not totaly equal. i would use dd at least.
but recreating the filesystem by hand an using rsync afterwards is easy.
What exactly is is a bootable disk for you ? what do you exspect when a disk fails ?
so far i know most systems wait until manual intervention if boot fails. a filesystemcopy
may be good enought i most cases.
Simply prepare a cdrom/floppy/usbstick/... with a bootloder an a menu that is ready to start from the backup disk. (normal pc-bios is very crappy when it comes to such tasks).
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LEARN ABOUT CENTOS
grub2-bios-setup
GRUB-BIOS-SETUP(3) Library Functions Manual GRUB-BIOS-SETUP(3)
NAME
grub-bios-setup -- Set up images to boot from a device.
SYNOPSIS
grub-bios-setup [-a | --allow-floppy] [-b | --boot-image=FILE]
[-c | --core-image=FILE] [-d | --directory=DIR]
[-f | --force] [-m | --device-map=FILE]
[-s | --skip-fs-probe] [-v | --verbose] DEVICE
DESCRIPTION
You should not normally run this program directly. Use grub-install instead.
OPTIONS
--allow-floppy
Make the device also bootable as a floppy. This option is the default for /dev/fdX devices. Some BIOSes will not boot images cre-
ated with this option.
--boot-image=FILE
Use FILE as the boot image. The default value is boot.img.
--core-image=FILE
Use FILE as ther core image. The default value is core.img.
--directory=DIR
Use GRUB files in the directory DIR. The default value is /boot/grub.
--force
Install even if problems are detected.
--device-map=FILE
Use FILE as the device map. The default value is /boot/grub/device.map .
--skip-fs-probe
Do not probe DEVICE for filesystems.
--verbose
Print verbose messages.
SEE ALSO
info grub
Wed Feb 26 2014 GRUB-BIOS-SETUP(3)