How to check the queue depth of a storage controller using ESXTOP

 From http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1027901

To identify the storage adapter queue depth:

1. Run the esxtop command in the service console of the ESX host or the ESXi shell (Tech Support mode). For more information, see Using Tech Support Mode in ESXi 4.1 and ESXi 5.0 (1017910) or Tech Support Mode for Emergency Support (1003677) .
2. Press d.
3. Press f and select Queue Stats.
4. The value listed under AQLEN is the queue depth of the storage adapter. This is the maximum number of ESX VMKernel active commands that the adapter driver is configured to support.

To identify the storage device queue depth:

1. Run the esxtop command in the service console of the ESX host or the ESXi shell (Tech Support mode). For more information, see Using Tech Support Mode in ESXi 4.1 and ESXi 5.0 (1017910) or Tech Support Mode for Emergency Support (1003677).
2. Press u.
3. Press f and select Queue Stats.
4. The value listed under DQLEN is the queue depth of the storage device. This is the maximum number of ESX VMKernel active commands that the device is configured to support.