Dlsset - HP StorageWorks 8B - FC Entry Switch Reference Manual

dlsSet

Turn on Dynamic Load Sharing (DLS) option.
Synopsis
dlsSet
Availability
admin
Description
Use this command to turn on DLS when a fabric change occurs.
Routing is generally based on the incoming port and the destination domain. This means that all the
traffic coming in from a port (either E_Port or Fx_Port) directed to the same remote domain is
routed through the same output E_Port.
To optimize fabric routing, when there are multiple equivalent paths to a remote switch, traffic is
shared among all the paths. Load sharing is recomputed when a switch is booted up or every time a
change in the fabric occurs. A change in the fabric is defined as an E_Port going up or down, or an
Nx_Port going up or down.
If DLS is turned off (using dlsReset), load sharing is performed only at boot time or when an
Nx_Port comes up. Optimal load sharing is rarely achieved with DLS disabled.
If DLS is turned on (using dlsSet), routing changes can affect working ports. For example, if an
Fx_Port goes down, another Fx_Port may be rerouted from one E_Port to a different E_Port. The
switch minimizes the number of routing changes, but some are necessary in order to achieve
optimal load sharing.
These changes can further affect the performance of a the fabric if the in-order delivery (IOD)
option is on. With the IOD option (refer to the iodSet command), routes are not available for a few
seconds after a fabric change. The time needed to reset the fabric routing varies based on the size of
the fabric. Some frame loss may occur because as the fabric is reconfiguring routes, frames are
dropped if they are delivered out of order. No frame loss occurs if IOD is off, but there is still a
short period of time when traffic is not forwarded. This period of time is significantly shorter than
when IOD is on, and is usually less than 1 second.
Operands None.
Examples To enable the dynamic load sharing option.
See Also
dlsReset
dlsShow
Fabric OS Reference
switch:admin> dlsSet
Committing configuration...done.
switch:admin> dlsShow
DLS is set
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Telnet Commands
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