The t105 supports the SAS5/iR controller which is about $110 and it supports RAID 0 and RAID 1.  See link below.

http://accessories.us.dell.com/sna/products/Controllers/productdetail.aspx?c=us&l=en&cs=19&sku=341-4341

If you don't mind using software based RAID, then you can use Windows to do so.

http://support.microsoft.com/kb/323442

See, "How to Manage Dynamic Disks".


I would recommand the hardware RAID controller though...

just what I'm trying to do.  SAS 5/IR controller doesn't have any SATA ports!!  Unless there's some other cable which is not included, I've got no idea how you'd connect them.  After hours with tech support on hold, they're sending me the SAS 6/ir, which like you said, takes the 'good deal' out of the equation.  Only Dell controllers seem to work with this box.