swap file using gmirror?

[bob self]

I'm running 5.4 RELEASE. I have two identical hard drives. I installed 
FreeBSD on the first drive and then
turned on gmirror. The 2nd drive sync'd in about 3 hours. I did create a 
swap partition, but part of the
procedure that I found to start gmirror adds

swapoff="YES"' to /etc/rc.conf

Is that the right thing to do? Should gmirror run without swap?

thanks,
Bob