Is SMART support available for SATA drives in SAS enclosures?

I'm testing this setup

LSI Logic SAS3800X PCI-X SAS controller (mptsas driver)
Promise V-Trak J300S SAS/SATA enclosure/expander
12x Seagate ST3500630NS
Linux kernel 2.6.21.1 x86_64
smartmontools-5.37-1.1.fc6 from Fedora Core 6

"smartctl -i -d sat /dev/sdc" gives me

Smartctl: Device Read Identity Failed

Same with "-d ata".

If I treat the disk as SCSI ("-d scsi"), the command
will not fail, but wil only retrieve the serial number.

Thanks,
Pim

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