HCIA Storage Practice Exam

During RAID reconstruction, the data rebuild process actively accesses the remaining drives to recreate the missing data and parity. This adds extra I/O workload, so the controller must share I/O bandwidth between normal host operations and the rebuild, resulting in higher latency and lower throughput for application I/O. In short, I/O performance typically decreases during rebuild. It won't double, won't remain exactly the same, and it won't drop to zero—the system continues servicing I/O, but with degraded performance due to contention and parity calculations.