10 Responses

  1. Dmitry Glebov
    Dmitry Glebov at |

    Hello Michael!
    Thnx for the useful article. Any suggestion why that happens? I mean latency spikes in storage system.

  2. Shaun D
    Shaun D at |

    Interesting….I just checked my hosts and we have this enabled as well ( unchecked ). However we are running ESXi 5.5 and vCenter 6.0.

  3. Shaun D
    Shaun D at |

    Any ideas on how to disabled this via Powershell or Cli? Trying to find the right command to use.

    1. @vcdxnz001
      @vcdxnz001 at |

      Hi Shaun, I've just updated the post with a link to how to disable stats collection using PowerCLI.

  4. Ted
    Ted at |

    Maybe I’m misunderstanding things but are you saying having the stats on affects performance of running vms or just gives false alerts?

    The way I read this option it’s just collecting statistics (used for SDRS I guess) but doesn’t actually do anything to affect performance since Storage I/O control is off. At worst it’s reporting false positives and feeding false data to SDRS (so the latter might make bad decisions). If you don’t use SDRS, is there any harm in having this on?

  5. AHV vs Vmware, AOS 5.0 edition – DontPokeThePolarBear

    […] Yes, Vmware has SIOC and SDRS, but these don’t really work with modern flash arrays or HCI environments. In fact if you are using Vmware with Nutanix or any other platform with advanced storage auto-tiering capabilities, it is advisable to turn SIOC off […]

  6. mavatko
    mavatko at |

    I’m using autotiering with SIOC manual threshold reasonably high – depending on tiers, but usually 30ms works pretty well. In this configuration you can still benefit from SIOC to some extend – till autotiering kicks in and migrates extends to the higher tier.

    AFAIK Storage spikes are caused by SIOC injector which is used if you have Percentage of peak throughput configured with SIOC, which is unfortunately default settings nowadays.


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