You can adjust the queue depth settings as needed to optimize the I/O performance of the devices. The appropriate queue depth settings (max tag count) for each operational environment must be carefully researched and determined. In addition, the requirements for host queue depth depend on the storage system model.
The following table lists the queue depth settings to ensure smooth processing at the ports and best average performance. Other queue depth settings, higher or lower than these values, can provide improved performance for certain workload conditions.
CAUTION:
Higher queue depth settings (for example, >2,048 per port) can impact host response times. Exercise caution when using queue depth settings that are higher than these values.
Queue depth settings
| Storage system | Best practice queue depth settings |
|---|---|
| VSP One Block 20 | Bidirectional ports (Target and Initiator):
|
| VSP 5000 series | Target ports:
Bidirectional ports (Target and Initiator):
|
| VSP G1x00, VSP F1500 |
|
| VSP E series | Bidirectional ports (Target and Initiator):
|
| VSP G130, G/F350, G/F370, G/F700, G/F900 | Bidirectional ports (Target and Initiator):
|
| VSP G200, G400, G600, G800, VSP F400, F600, F800 |
|