HP StorageWorks Auto Path VA Software - Manual (Page 7)

Auto Path features 7
Dynamic load balancing
Auto Path performs dynamic load balancing while monitoring each path to
ensure that the I/O transaction is completed. The load balancing policy is
selected by the administrator.
The dynamic load balancing policy prevents any path from becoming
overloaded, and it helps to prevent the congestion that occurs when many
I/O operations are directed to common devices along the same path.
If a preferred path is used for a device, the entire I/O for that particular
device flows through the preferred path. No load balancing is done by Auto
Path for that device.