Which of the following is an indication of acceptable storage array performance?

A high cache hit ratio signifies that the storage array's cache is effectively serving data requests, reducing the need to access slower backend storage and thus improving I/O response times and overall performance. When data is retrieved from cache, it is significantly faster than reading from physical disks, leading to better throughput and lower latency.

Low MTTF (Mean Time To Failure) indicates poor reliability and higher risk of component failure, not good performance.

Low buffer-to-buffer credits in a Fibre Channel environment can indicate congestion and a bottleneck, which degrades performance.

High I/O wait indicates that the CPU is idle, waiting for storage I/O operations to complete, which is a symptom of poor storage performance.