To monitor command queuing in VMkernel, follow these steps:

1. Open up the SSH Client and log in to ESXi.
2. Run the esxtop command there.
3. On the screen, select D to monitor the adapter's queue.
4. Check the KAVG/cmd column and monitor the value there:

To monitor queuing at the device level, follow these steps:

5. Open up the SSH Client and log in to the ESXi.
6. Run the esxtop command there.
7. On the screen, select U to monitor the disk device's queue.
8. Check the ACTV and QUED columns and monitor the value there: