GRML
Used by Blue Light as an alternative to Crowbar.
Includes a version for i386 and amd64.
Iso available on Blue Light server and can be downloaded here: http://grml.org/
Use
At boot choose the version according to your CPU architecture
Activate all the RAID array
http://wiki.bluelightav.org/display/BLUE/RAID+with+MDADM#RAIDwithMDADM-StartthearraysatonceActivate all the LVMs
http://wiki.bluelightav.org/display/BLUE/LVM#LVM-ActivateLVMs
Crowbar
Former rescue system used by Blue Light and developed by the other Manu 
Not developed anymore and does not include some of the tools we need (LVM).