how to turn on fast-write for an ssa card

Can I turn on fast-write for the following SSA cards?

I guess I'm going to have to vary off the appropriate volume groups
first?





lscfg -vl ssa3 | grep CACHE

Device Specific.(Z1)........CACHE=00





lscfg -vl ssa2 | grep CACHE

Device Specific.(Z1)........CACHE=00



ssaraid -I -l ssa3 -n hdisk250|grep -i fast

fastwrite off





Thanks.