Port speed for ISL's and SP's , Hosts (MDS 9513)

Unanswered Question
Mar 26th, 2009

Is there any recommendation/best practise for

1) setting port speed ie choose Auto or hard code eg 2gb, 4gb wrt b/w available ?

2) ratemode ie dedicated or shared ?

For ISL's And Storage processors/Controllers and hosts


I have this problem too.
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Michael Brown Thu, 03/26/2009 - 11:41

For ISL's, if the line card is gen2, it must be configured as dedicated. For the port mode, I would recommend that you hard code the mode to E. I also like to code the speed on ISLs so that there is no chance that they would negotiate to a slower speed. IE: you don't want to have a 2GB link negotiate at 1GB.

As for storage controllers, depending on the fan in ratio, I would recommend hard coding them to the device speed, and if the port-group has the bandwidth available, make them dedicated.

As for hosts, they should be on the shared port, and I would leave them as port mode = auto. This way they can negotiate F or FL. You might want to configure a 'maximum allowable auto speed setting'.

IE: if your hosts have 2GB HBAs, and are plugged into a 4GB capable port, they will never negotiate to 4GB...so why have the MDS think it needs to keep some bandwidth for that port (in shared mode). I forget the command, but there is way to set auto-max for the port speed on shared ports.

Hope this helps,



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