This command allows you to set a controller-based write cache policy. If the policy is set to
cacheoff and a unit degrades, the firmware will disable the write-cache on the degraded unit, regardless of what the unit-based write cache policy is. If the policy is set to
follow and a unit degrades, firmware will follow whatever cache policy has been set for that unit. (For details about the unit-based policy, see
/cx/ux set cache=on|off [quiet].)