Hi jeanke,
if your card has died, you just replace it, and your external SAS Raid will appear.
You can still use it, when it is in proper working condition.
You just need a new SAS card, like the one Bob has mentioned.
What proavio raid do you use?
cheers
Rainer
factstory
Rainer Wirth
phone_0049-177-2156086
Mac pro 8core
Adobe,FCP,Avid
several raid systems