Order of boot devices

I have an Xserve with 3 hard-disks. The first one is the normal Boot-Device. For failsave reasons i made a copy of the OS X-Server-Installation on the Second hard-disk. And on the third i have a leo-Client-Installation.
How can i define which device is the second and the third boot device.
To tell the machine: If harddisk "Boot" is not available, come up with "Boot2" and not with "Leo"
Greets from Germany
Jan

Isn´t there any option to do so by editing a system configuration file at the terminal ?
The decision is made by the EFI console environment. EFI is quite unlike a BIOS, and is a full operating system in its own right. A typical EFI installation has drivers and a command shell and diagnostics and related. The decision and configuration and the boot sequencing occurs in that environment, and (beyond sniffing the individual partitions) before the partitions containing the operating system are particularly investigated.
The EFI tools and controls that Apple supports (beyond the GUI stuff and bless) are fairly minimal, and Apple does not expose EFI to users.

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