The earlier (2008) Opensolaris drivers tended to crash the server if you pulled 
out an active drive. It may have improved in later releases.
In the case of the Sun Storage Appliances, the sata (and sas) drivers used are 
different from those in Opensolaris and are considerably better featured.

My understanding is the chipset on the sata cards can't handle drive events as 
well as sas controllers do. 

After testing of both options, I concluded that sas was the better choice 
because of this, cabling complexity (24 bay chassis isn't fun), and 
expandability.
The controller and backplane price difference diminishes when you get to 24 
bays.

Mark.
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