Corruption can always occur if the moons and sun don't align for you on the day of the power outage. Battery backup is usually req'd if you want to use write-c

Corruption can always occur if the moons and sun don't align for you on the day of the power outage. Battery backup is usually req'd if you want to use write-caching on your RAID. You can also use flash backed RAID controllers, it's prolly better than a battery backup today. Ultimately, keep things in perspective. The battery backup option might be the same cost as a decent UPS. You can also always build your own or get a decent zfs appliance.