When 7.2 could see and mount these partitions automatically and without any doing anything special, you shouldn't have to do anything else then filing a bug report.
Of course it could help the developers, if you could point out which FreeBSD version (7.3, 7.4, 8.0, or 8.1) lost the ability to create the /dev/ad3s1 and /dev/ad3s2 devices.
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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