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non equal cost paths

  • 1.  non equal cost paths

    Posted 10-16-2014 08:36 AM

    Hi all, In a SAN network that I am currently loooking at the Stoarage Arrays are connected up to different switches. Therefore the host when connecting to a LUN on the storage array will have a number of paths which vary in cost. Some paths have just one hop while others have 2 hops. In addition some hops are going through patch panels while others do not. Is this a major issue could anyone advise?

    The storage array's consist of mainly a Symmetrix and VNX storage arrays.

    Thanks!


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  • 2.  Re: non equal cost paths

    Posted 10-17-2014 05:04 AM

     Hi,

     

    FOS assigns a cost to each hop, and a switch will use the least-cost path to route traffic to a destination. So if you have paths with different costs, only the ones with the least cost will be used. When it comes to patch-panels, they are not taken into account when it comes to stablishing the cost. Provided that the quality of the signal is fine, it doesn't matter if the path has 0 or n patch-panels.

     

    rgds,

    Felipon


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  • 3.  Re: non equal cost paths

    Posted 01-09-2015 08:53 AM

    In relation to the host does non equal cost paths have an affect on what HBA port it sends traffic over? The host would be running VMware ESXi with PowerPath. 


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