smartd with ahci

[Andy Burns <fedora-test adslpipe co uk>]

My motherboard is configured so the SATA drives show up as ahci devices 
rather than legacy ide devices, fedora itself recognises the disks OK, 
however smartd fails to start.

I did some investigation with smartctl and found that it was necessary 
to use

	smartctl -a -d ata /dev/sda

with the "-d ata" being required to make it use libata, so I modified 
the entries in /etc/smartd.conf to also have the "-d ata"

/dev/sda -d ata -H -m root localhost
/dev/sdb -d ata -H -m root localhost

now smartd is happy.

I'm not sure if anaconda (or something else) should have have recognised 
the ahci devices at install time and made appropriate entries in 
/etc/smartd.conf, in which case I should file a bug, or if this is 
something the user should expect to have to configure, in which case 
hopefully this message might help someone else out ...