McDATA ULTRANETTM EDGE STORAGE ROUTER 3000 Dokumentacja Pobierz pdf (Strona 53)

Switch Considerations for FICON

McDATA i10k, 6140, 6064, and 3232 Switches

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Setting the Fibre Channel Port Speed

All Fibre Channel switches allow a port to be set to auto negotiation , 1 Gbps or 2 Gbps. Ultranet

Fibre Channel link startup is more efficient and more reliable when the Fibre Channel ports are set

to a specific speed, when available. Most devices and IBM host channels are not configurable.

McDATA recommends that the attached Fibre Channel switch port be configured to 2 Gbps when

attached to a Edge 3000. If necessary, the Edge 3000 can also be set to a specific speed using the

PortSpeed parameter in the FibreChannel configuration file.

Setting the Fibre Channel Port Type

Ultranet Fibre Channel link startup is more efficient and more reliable when the Fibre Channel

ports are set to a specific type, rather then the generic type (G_Port). When configured as a G_Port,

a switch will first attempt to send an ELP frame to determine if E_Port will be successful. If the

ELP is not successful then the port will wait for a FLOGI frame to arrive. This can cause difficulty

during link startup for extended non ISL topologies, or switch F_Ports. Certain devices will have

more difficulty then others when operating as G_Ports in extended environments.

High Integrity Feature

When MCDATA Ultranet systems are located between FICON cascaded directors (switches) in an

ISL configuration (E-Port/B-Port), IBM requires that the "High Integrity" feature be installed

(Secure Fabric be enabled). The High Integrity feature is enabled in the switch configuration. If

enabled, the MCDATA Ultranet FibreChannel file must specify

SwitchWwnProxy=yes.

McDATA i10k, 6140, 6064, and 3232 Switches

It is very important to ensure that the McDATA switch port is configured for extended distance by

increasing the bb_credits beyond the default of 16. The bb_credits should be increased to 60 or

above. Failing to do so will not only affect performance but could result in a bottle neck causing

FICON aborts (timeouts). In older McDATA switches you may have to ensure that the McDATA

switch port is configured for extended distance by selecting the 10-100 km column in the configure

ports window. Doing so will change the number of bb_credits to 60.

McDATA switches may be installed with a McDATA Feature called preferred path ISL

configuration. If the preferred path is mis-configured, the Edge 3000 may only see traffic in one

direction, causing FICON emulation processes to fail. Be sure traffic for a CHPID is flowing in

both directions (Rfx and Tfx entries) on the same ISL.

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McDATA ULTRANETTM EDGE STORAGE ROUTER 3000 Dokumentacja Strona 53