[9fans] Venti config for booting from fs(3)

[Anthony Sorace <anothy@gmail.com>]

I'd like to set up my spiffy new cpu server to boot from a venti  
using at least mirrored arenas via fs(3). A few questions on this:
	• I'm mirroring the arenas to insure against drive failure. Does it  
make sense to also interleave the indexes? Both of them?
	• I've got three disks. The venti arenas will be on two. Will the  
indexes benefit significantly from either being interleaved across  
three, or only on the third (with the fossil)? I understand that this  
is somewhat usage-dependent; I guess the real question is how  
sensitive are the indexes to write times?
	• The venti would be used for the fossil boot partition, so needs to  
be there at startup. fs(3) suggests sticking the config on a floppy  
(!). This seems like not the most reliable option. Where are others  
sticking their fs(3) configs for boot?
	• Once there's an fsconfig var, how does the rest of the startup go?  
I don't see it pulling that in anywhere. This needs to be well before  
cpurc, right? Will this require a custom boot?
Anthony