[CS-FSLUG] Linux Drive Cloning

[Karl Kleinpaste]

Just FYI, because it might be useful to some folks...  I've attached the
script I use these days for backup.  It uses rsync to clone partitions.

My partition layout looks like this:

/dev/sda1   *           1          26      208813+  83  Linux
/dev/sda2              27        3943    31463302+  83  Linux
/dev/sda3            3944        7860    31463302+  83  Linux
/dev/sda4            7861       77825   561993862+   5  Extended
/dev/sda5            7861        9950    16787893+  82  Linux swap / Solaris
/dev/sda6            9951       10995     8393931   83  Linux
/dev/sda7           10996       77825   536811943+  83  Linux

Filesystem           1M-blocks      Used Available Use% Mounted on
/dev/sda2                30244     20702      9543  69% /
/dev/sda1                  198        77       122  39% /boot
/dev/sda3                30244     20503      9742  68% /.alt
/dev/sda6                 8069      1589      6481  20% /usr/local
/dev/sda7               516005    108378    407627  22% /home

Notice sda[23].  I configure discs with 2 root filesystems.  The current
root is of course on /.  The previous incarnation of Fedora is on /.alt.
I do this on all my systems, as a way of preserving (especially)
configuration information as I upgrade from one release to the next, and
more than once I've recovered an interesting needed library from the
last incarnation that turned out to have been missing from a new one.
So, at the moment on this laptop, / is F13 on sda2, and /.alt is its old
F12 on sda3.  At the end of this year when F14 comes out, I'll overwrite
F12 with it on sda3, and sda2 will become /.alt.

The script believes that it will find a clonable backup disc available.
It wants to be run either on my desktop (mesquite), which has a disc
mounted in an ordinary way, and for which the partitions are present as
though it were a complete system, echoing this layout under
/media/backup; or on my laptop (awol), for which I have a USB drive that
auto-mounts itself as 5 equivalent, non-hierarchical filesystems.

It has options:
# -a|--alt      include /.alt
# -k|--kidding  echo only
# -t|--test     for dir existence before rsync
# -p|--progress indicators

I don't routinely backup /.alt because in principle it should not
change.  The kidding option is for testing what the script should do,
and kidding is assumed if not run by root.  The test option makes sure
that the expected destination directories are in place, which is needed
because sometimes things that I do with the detachable USB drive lead to
funny choices on the part of HAL for a mount point.  Progress indicators
give just another rsync switch, usually not very useful.

The script requires recent bash because it uses associative arrays
(declare -A) to name filesystems to be backed up.

Embellish to taste.

--karl

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