To ensure data integrity in a RAID system connected to a UPS, what is MOST likely needed?

Installing battery-backed cache on the RAID controller is essential for ensuring data integrity in scenarios where a RAID system is connected to an uninterruptible power supply (UPS). The battery-backed cache allows the RAID controller to temporarily store data that is being written to the disk. In the event of a power failure, the cache retains this data until power is restored, ensuring that no data is lost or corrupted during the write process. This is particularly crucial in a RAID setup, where maintaining consistency and integrity across multiple drives is vital for the overall health of the data storage system.

The other options may contribute to system reliability or performance but do not directly address data integrity in the same way that battery-backed cache does. Additional memory on the RAID controller can enhance performance by allowing more data to be temporarily stored, but it doesn’t necessarily prevent data loss in the event of power interruption. Redundant RAID controllers can provide fault tolerance and high availability, but they do not impact the integrity of writes to the disk in a power failure situation. Updated firmware can improve performance and security but is not a direct measure to ensure data integrity in power failure scenarios.