Server hang : MBR installation after dump and restore on new hard disk

Warren Block wblock at
Thu Jan 16 15:56:12 UTC 2014

On Thu, 16 Jan 2014, eras mus wrote:

> Dear List,
> Thank you all for the help. I understood that the old hard disk is dying.
> I booted with a FreeBSD Live CD with the new hard disk.
> Now it detected the old hard disk as /dev/ad4 and new one as /dev/ad7.
> Then using sysinstall did slicing and partitioning on the new hard 
> disk(ad7). Then dump and restore performed on all the partitions of 
> the old hard disk to the new hard disk partitions.

While sysinstall had a reasonably nice user interface for disk 
partitioning, it was and is buggy and best avoided on current versions 
of FreeBSD.

> After performing dump and restore to the new hard disk, I edited the 
> /etc/fstab of the root partition so that it will update the /etc/fstab 
> for the new hard disk partitions(ad7s1a,ad7s1d,ad7s1f ..... instead of 
> the ad4 entries in the /etc/fstab)
> Now when i try to boot the machine with both the hard disks as attached.
> It is showing as below
> F1 FreeBSD
> F5 Drive 1
> When i select F5 it is going to a GRUB prompt of the new hard disk
> ,Because it already had a linux installation before doing the dump and
> restore operation.
> As per my understanding FreeBSD  Boot Manager is not installed for the new
> hard disk. Am I right?

Yes.  Use 'boot0cfg -B ad7' to install it to the new drive, or
'fdisk -B ad7' for a plain MBR that just boots without showing the menu.

You may also need to install bootcode to the BSD partitions themselves. 
This can be done with 'bsdlabel -B ad7s1'.  I'd recommend using gpart 
instead, but you don't say what version of FreeBSD you have, and it may 
be old enough that gpart is not present.  If gpart is present, see

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