Create a file /autosetup in the rescue system, that may (or may not) look like this:

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DRIVE1 /dev/sda
DRIVE2 /dev/sdb

SWRAID 1

SWRAIDLEVEL 1

BOOTLOADER grub

HOSTNAME nyx

PART /boot  ext2        512M
PART swap   swap         12G
PART lvm    vg0          all

LV vg0      root         /              ext3        5G
LV vg0      home         /home          ext3       50G
LV vg0      usr          /usr           ext3       10G
LV vg0      tmp          /tmp           ext3        5G
LV vg0      var          /var           ext3        5G

IMAGE /root/.oldroot/nfs/install/../images/Debian-70-wheezy-64-minimal.tar.gz