[OpenIndiana-discuss] Options for a root filesystem

[Vishwas Durai]

Hello all,
I'm wondering what options are available for root filesystem in OI? By 
default,  install  uses ZFS and creates a rpool. But If I'm a ZFS hacker 
and made some changes to some core structures, how does one go about 
debugging that? Is dropping to kmdb and debugging the only available 
(painful) option?
Any experience that you can share with this will be very helpful.
Thanks,
Vish.