I've been thinking to install FreeBSD 9.1 on a zfs file system but I've encountered a problem regarding ZFS pools. I'd like to put /boot, / and /usr to a ssd and /var, /tmp, /swap and /home to a hdd to extend the life of the ssd. The problem is that I'm not sure what should I do with the zpool. Should I make own pool for both disks?