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Loss of one connection ISL?

  • 1.  Loss of one connection ISL?

    Posted 12-13-2019 10:17 AM


    Simple question, in the event of link loss of one connection between to 2 FC switches in a fabric.
    Would client on one side loss there connectivity for a short while if the client where to be
    connected on that active path that was lost?

  • 2.  RE: Loss of one connection ISL?

    Posted 12-16-2019 02:09 AM
    @Leif Hannusas   I guess the answer is: it depends.    If the client was using the lost path, some of his frames will usually be lost..

    It depends on a couple of factors:  ​ I.e.
    - How long is the link lost / offline? Can upper layer protocols (Multipathing & SCSI) cope with the lost frames and work with retransmits
    - Are there alternative routes between datacenters, so Fibre Channel routing  would be able to cope with the lost link ans only above would have to work for a short period of time?

    If you're talking about a client with only local connections (not traversing the lost link), then it would be:
    - Are there alternative pathes between datacenters, so the Fabric won't have to undergo  a "Build Fabric" event, which might (seldom) cause some hickups even on local clients (depending on the OS and configurations)

    Senior Systems Engineer
    Broadcom - Brocade Storage Networking