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Topic
  • 2 replies
  • Latest Post - ‏2009-01-29T18:22:30Z by aixylinux
aixylinux
aixylinux
4 Posts

Pinned topic IVE: How are LHEA ports mapped to physical ports?

‏2009-01-20T14:46:26Z |
Refer to the right side of figure 3-2 in redp4340 (+IVE Adapter Technical Overview and Introduction+). A screen shot is attached for your convenience. The FC 5639 has 4 physical ports, 2 per port group. Consider the case where the MCS value is 1, which means there are 16 LHEA ports per port group (Port group 2 case in the figure).

Does traffic from any LHEA port in port group 2 flow through either physical port in the port group? Or are half the ports in the port group assigned to one physical port and half assigned to the other? The latter case is the way the figure is drawn, but I am not sure whether that is just an example or is a rule.
Updated on 2009-01-29T18:22:30Z at 2009-01-29T18:22:30Z by aixylinux
  • SystemAdmin
    SystemAdmin
    134 Posts

    Re: IVE: How are LHEA ports mapped to physical ports?

    ‏2009-01-29T03:14:03Z  
    When MCS is 1, there are total 16 logical ports are available between 2 physical ports of that port group. The 16 logical ports does not have to be equally divided between two physical ports. One can create all 16 logical ports from one physical port and then 2nd physical port will have none left. Hope this helps.
  • aixylinux
    aixylinux
    4 Posts

    Re: IVE: How are LHEA ports mapped to physical ports?

    ‏2009-01-29T18:22:30Z  
    When MCS is 1, there are total 16 logical ports are available between 2 physical ports of that port group. The 16 logical ports does not have to be equally divided between two physical ports. One can create all 16 logical ports from one physical port and then 2nd physical port will have none left. Hope this helps.
    Thanks for the reply. To reinforce the point, then, is it necessary to manually load balance the LHEA ports across the physical ports? If so, then the implication is that in the absence of any other information about the network load by LPAR, one would split the LHEA ports equally across the physical adapters. But if one knows a particular LPAR is a heavy user of its LHEA port, then there should be fewer LPARs on that physical port and more LPARs on the other physical port.