IO Timeout

I have a question about IO timeouts:

We are using the 3ware escalade 9500S series of cards, and we had a
drive failure this morning.  Apparnetly the card waits 30 seconds for
the drive to respond, and if it doesn't, it put's the drive in a fail
state.  Postgres it seems didn't wait 30 seconds before it decided
that the system was upset, and put the database in maintainence mode.

Is there a way to increase to IO wait timeout so this doesn't happen?

Alex Turner
netEconomist