FreeBSD 9, GPT and gmirror

[Janos Dohanics]

Hello Everyone,

May be I should have searched more for answers, but after installing
FreeBSD 9 with gmirror, I am wondering if the experts here have some
recommendations for "best practices".

1. The Guided partitioning doesn't suggest any more to
create /var, /tmp, /usr, etc. file systems. Is it really the
recommendation to go with just / ?

2. Is there a way to use the old sysinstall to install FreeBSD 9? 

3. It seems that setting up gmirror is more involved with GPT
(http://blather.michaelwlucas.com/archives/1071); now I have a mirror
for each of the filesystems /, /var, /tmp, etc. Is it OK to use gmirror
in this way at all?

4. Also, with GPT, one has to be in single user mode to synchronize
disks - correct?

3. Assuming one has enough RAM, is zfs mirror or raidz recommended over
gmirror?

Prior to FreeBSD 9, I used to take the the sysinstall defaults with
some overrides as I thought appropriate and proceeded to set up
gmirror - it was simple and not a lot of work, and a good way to make
use of older systems...

-- 
Janos Dohanics