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#Power
#Power
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  • 1.  VIO IO Performance

    Posted Mon March 05, 2007 09:23 AM

    Originally posted by: TobiasH


    Is there are direct correlation between the IO performance of virtualized devices and the number of LPARs on the system?
    #AIX-Forum


  • 2.  Re: VIO IO Performance

    Posted Mon March 05, 2007 03:49 PM

    Originally posted by: dukessd


    Obviously.
    As to what the limits are, well that is another question.
    If the VIOS is performing lots of operations like iscsi, multipathing, multiple shared ethernets and hosting lots of very busy virtual disks, etc. then you are going to need to give it a bit more memory and some more processor power if you don't want it to be a bottleneck.
    Although unsupported, you can use the oem_setup_env and normal AIX performance monitoring commands to see how it is coping. (I say normal as in installed with the VIOS, don't install anything else like nmon - VIOS will become unsupported if anything other than device drivers (and possibly SSH - jury still out on SSH) is installed).
    I say "unsupported" because I believe oem_setup_env is ONLY supported for installing device drivers (and maybe SSH).
    That said, as long as you don't try tuning the VIO server in any other way than adding memory and CPU, you shouldn't have any issues with support.
    So you can monitor its progress / performance with vmstat, svmon, etc.
    #AIX-Forum


  • 3.  Re: VIO IO Performance

    Posted Mon March 05, 2007 04:01 PM

    Originally posted by: TobiasH


    Thanks for the update. At this point, all our VIO servers have 2 GB (desired) RAM and we could assign more memory if necessary.
    #AIX-Forum