content_image/980773.jpg
Figure 11-125 shows a comprehensive view of the available performance functions. 

<img src='content_image/980773.jpg'>

To learn how to obtain statistics from the DS CLI, see 12.5, “Metrics with DS CLI” on page 423. 

## 11.13.1 Performance statistics 

Important:  All of the listed performance statistics are averaged over one minute. The performance graphs cover data that is collected for the last seven days. For long-term performance statistics, use IBM Spectrum Control. 

Users can monitor the following resources and performance metrics: 

GLYPH<SM590000> System performance metrics: 

– IOPS: Total number of processed requests in thousand I/O operations per second (KIOPS) for the selected I/O operations. 

– Latency: Response time in milliseconds (ms) for the selected I/O operations. 

– Transfer Size: Number of kilobytes per I/O operation (KB/operation) for the selected I/O operations. 

– Bandwidth: Number of megabytes per second (MBps) for the selected bandwidth type. 

– Cache: Percentage of read hi ts (read I/O operations that were fulfilled from the system cache or memory) and write delays (I/O operations that were delayed because of write cache space constraints or other conditions) during one minute. 

– Capacity: Total capacity and allocated capacity of the storage system in gibibytes (GiB). 

– Power: Power usage of the storage system in watts. 

– Temperature: Average temperature of the storage system in degrees Celsius. 

