Fixing a Broken initrd in Linux

I recently had a situation where a host's disk controller failed.
The box would get partially through a BIOS post before throwing errors
about the failed controller and then fail to boot.  To resolve the
situation, we effectively replaced said controller.  This, however, lead

Breaking and Syncing an MD Root Mirror

Here's one of those times where I thought, "I wonder", as in I wonder if
I can break an MD root mirror and sanely recreate it.  You can do so with
other software RAID solutions so why not here?  Well, you can.  There is
nothing short about this procedure, taking 80+ commands to accomplish.

Creating an MD Root Mirror in Linux

For whatever reason, you originally set up your Linux host without a root
disk mirror and now you want it mirrored.  One could say "just re-install,"
but surely there is another way, and there is.  The solution isn't quick
or simple, though it isn't impossible.  Our host details are:

Missing GRUB Config in Linux

Having recently written up how to restore GRUB to a missing / corrupted
master boot record (MBR), it seemed appropriate to follow up with
resolving a missing GRUB config file.  Our host details for this
situation are:

Disk Cloning in Linux

A while back, I wrote up how to clone a disk in Solaris and in FreeBSD,
yet somehow managed to overlook writing up how to do so in Linux.
This write up is to rectify just that, how to clone a disk, in this case,
the root disk, in Linux.  The following are our setup details:

GRUB, a Corrupted MBR, and Linux

Recently, after cloning a root disk in Linux, I ran into an issue because
I failed to setup the master boot record (MBR) on the alternate disk.
Everything else was configured, including the boot image files and grub
configuration under /boot/grub, but the MBR wasn't setup.  The following

BIOS Boot Device - Solaris

In 'Host Info - Boot Parameters', we saw how the boot device on Solaris
could be identified using 'prtconf'.  The output was similar to:

        boot-device:    '/pci@1e,600000/ide@d/disk@0,0:a

Disk Cloning in Solaris

Disk Cloning in Solaris:

A few assumptions:
        master disk:  c0t0d0