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Vios I/O Workload Seapration

  • 1.  Vios I/O Workload Seapration

    Posted Wed March 10, 2021 12:43 PM
    I would be interested to know your views on separating out IBM i and AIX i/o workloads over multiple vios servers (dedicated to each o/s )  vrs HBA segregation of the i/o traffic on a dual vios server configuration ?

    Rgds

    Mick

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    Mick Sharp
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  • 2.  RE: Vios I/O Workload Seapration

    IBM Champion
    Posted Thu March 11, 2021 11:10 AM

     

     

    Hi Mick,

     

    We have this setup in our environment.  We have IBMi and AIX LPARs running on the same physical managed server.  We have a dual VIO server setup for IBMi and a dual VIO server setup for AIX.  Each VIO server has a dedicated dual port Fiber Channel adapter assigned to it along with a dual port Network adapter.  When we initially setup these VIO servers there was a setting that we were not able to make on the IBMi VIO that we were able to make on the AIX VIO.  But over time that limitation was corrected.  I think it is a good idea to separate them out like this to ensure that your AIX workload does not affect your IBMi workload.  Our IBMi workload does not have as much flexibility as our AIX workload in terms of expectations regarding performance.  Hope this helps.

     

    Regards,

     

    Norman Owens






  • 3.  RE: Vios I/O Workload Seapration

    Posted Fri March 12, 2021 06:44 AM

    Hi Norman , thanks for your response that's interesting.

    We also have a managed server running both IBMi and AIX LPARS , but using a single dual VIO server setup with HBA port separation on each.This worked fine until we recently upgraded our managed server and migrated our LPARS over, but also adding an IBMi LPAR with a large 'Read' profile to the SAN . Subsequently both IBMi and AIX I/O response's suffered and we had to move the new IBMi 'read' workload off onto another managed server / SAN to resolve it.

     Experts involved with resolving the issue were surprised we had this configuration, and have advised at least HBA card separation , if not separate VIOS setups for both.

    Are there any definitive rules for new VIO configurations relating to I/O workload best practise , particularly with IBMi & AIX ?     

     

    Rgds   



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    Mick Sharp
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  • 4.  RE: Vios I/O Workload Seapration