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Chapter 2 NAS Head 2-67
8. Select option 7, “Save Changes”
9. Press [Esc] to return to the menu, or proceed as above to define another route.
2.13.1 NIC speed and duplex negotiation issues.
StorEdge is reporting Ethernet transmit and receive errors on a
switched network.
By default, the StorEdge Ethernet driver is set to auto-negotiate speed and duplex.
This works well the great majority of the time, but occasionally there is a problem in
the negotiation between the switch and NIC. The primary indications of this
problem are extremely slow transfer speed and an increase in packet errors, usually
collisions, which can be found in the port statistics on either the StorEdge or the
switch.
Note – These problems are not isolated to StorEdge. We have investigated
performance issues where other workstations on the network were the source of
performance problems for exactly this reason.
The source of this problem is that the speed and duplex were not successfully
negotiated. When a NIC or switch port is initialized, assuming that it is configured
to auto-negotiate, the NIC and the port will negotiate the highest available speed
and duplex.
One possible cause for this is that either StorEdge or the switch port is not set to
auto-negotiate. Forcing a particular setting, such as 1000Mb/full duplex, causes the
device not to negotiate. Therefore, if only one side is set to auto-negotiate, the
negotiation will fail.
It is also possible that the negotiation can fail even though enabled on both sides.
First, you should try another cable, and another switch port, as negotiation problems
can be caused by hardware. If negotiation is still unsuccessful, the final recourse is to
force both StorEdge and the connected switch port to the desired speed and duplex.
The following commands are used to check and/or force speed and duplex for the
StorEdge Ethernet driver.
This functionality is only available at the StorEdge CLI (command line interface).
1. To access the StorEdge CLI, connect to the StorEdge via Telnet, and type “admin”
at the [menu] prompt and enter the administrator password.