How to find and move boot sectors?

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Operating Systems Linux Debian How to find and move boot sectors?

01-15-2013

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How to find and move boot sectors?

Hi
A mismatch occurred on my system (Debian, Sid). I've got 3 disks sda, b, c.
Unfortunately, when I was adding a third disk (sdc) it all finished so that both sdb and sdc now have a boot flag. So, the first thing I would like to find out is which disk the system now boots from: sdb or sdc? In which log and how can I find that? The next thing is: If sdb, where is the boot sector? (I would like to erase all files from sdb). Is it in the master boot sector (outside of the partions of the disk) or in the volume boot sector (inside the first partition of the disk)? In which log can I find that and how? If it is in the volume boot sector I must not reformat the disk. The third question is: How can I move the boot sectors? I would like to move the boot sector to sda and remove boot labels from sdb and sdc. But sdc also hosts Windoze 7? Is that a problem. So, I should change grub, fstab, and what else? And how?
Thanks,
Mladen.

mladen

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LEARN ABOUT HPUX

bootconf

bootconf(4)						     Kernel Interfaces Manual						       bootconf(4)

NAME

       bootconf - boot device configuration table

DESCRIPTION

       The file contains the address and disk layout type of the system's boot devices or lif volumes.	It is used by the and HP-UX kernel control
       scripts (fileset to determine how and where to update the initial boot loader.  Normally the kernel's script queries the system's  hardware
       and creates the file.  In rare cases when either the system configuration cannot be automatically determined or additional and/or alternate
       boot devices should be automatically updated, the administrator must edit the file manually.

       There is one line in the file for each boot device.  Each line contains the following blank-separated fields in the order shown:

       disk type   A flag indicating how the file system(s) on the disk are laid out.  The flag must be one of the following:

		   Indicates that the root disk is in LVM or VERITAS Volume Manager
			  (VxVM) format.  If LVM or VxVM mirrors are used, then each of the "mirrors" must have its own line in the file.

		   Indicates that the root disk is in the
			  "whole disk" format with no partitions, but boot and swap space are reserved outside the file system.

       device file The absolute path of the device special file that accesses the physical device where the boot area is located.   For  LVM  root
		   disks,  the	device	special file is the physical volume(s) returned by the command.  For "whole disks" this is the device file
		   that references the entire disk.

       Blank lines are permitted.  Any line beginning with a is considered to be a comment.

DIAGNOSTICS

       The Software Distributor log file contains diagnostic messages under the fileset if the file is incorrect.  Most of the messages are  self-
       explanatory; a few warrant additional explanation:

       If there are no other messages about
	      the  file  is probably empty.  Otherwise, the file is not in the proper format, and the other messages will explain what the problem
	      is.

       The specified device file does not point to a disk where there is a
	      lif which contains the file

       Some character other than
	      or is in the first field of a line.

       As of release 10.0, the boot areas in
	      must all be on the same type of disk layout.

       There are characters after the
	      device file specification.

EXAMPLES

       The boot area is on an LVM root disk:

	      l /dev/disk/disk7_p2

       The boot area is on a whole disk layout:

	      w /dev/disk/disk7

WARNINGS

       All of the boot devices in the file must have the same disk layout.

AUTHOR

       was developed by the Hewlett-Packard Company.

FILES

SEE ALSO

       mediainit(1), hpux(1M), hpux.efi(1M), mkboot(1M), vgdisplay(1M), lif(4), intro(7).

       documentation.

																       bootconf(4)