newfs during install

[Chris Zakelj]

Trying to install 4.3 from scratch onto the machine I use as my home 
file server, coming against a problem.  The previous configuration was 
4x160g as a RAID-5 for OS/support/whatever, and 4x300g drives RAID-5 for 
samba.  I've changed the config so that it's now 2x160 as RAID-1, and 
6x300 as RAID-5, necessitating the reinstall.  The problem I'm having is 
that the 1.5T array now exceeds the install script's 2^31-1 limitation 
of an FFS filesystem.  Is there a way I can pass "-O 2" to newfs during 
installation (telling it to use FFS2), or am I better off using growfs 
once the system is up and running?