get vm with highest disk latency

[SG1234]

hi folks -- I am trying to get a list of NAS datastores which have more disk latency -- is there a way one could get VM and NAS datastore details of the top 5 VMs wrt disk latency in a given farm

thanks,

~Sai Garimella

[LucD]

You can do something like this the VMs.

It will list the current (relatime) top-5 for write latency

$stat = "virtualdisk.totalWriteLatency.average"

$vms = Get-VM

Get-Stat -Entity $vms -Stat $stat -Realtime -MaxSamples 1 -ErrorAction SilentlyContinue |

Sort-Object -Property Value -Descending |

Select -First 5 |

Select @{N='VM';E={$_.Entity.Name}},Instance,Value

For the datastore top-5 you can do

$stat = "datastore.sizeNormalizedDatastoreLatency.average"

$esx = Get-VMHost

$dsTab = @{}

Get-Datastore -RelatedObject $esx | %{

    $dsTab.Add($_.ExtensionData.Info.Url.Split('/')[5],$_.Name)

}

Get-Stat -Entity $esx -Stat $stat -Realtime -MaxSamples 1 -ErrorAction SilentlyContinue |

Sort-Object -Property Value -Descending |

Select -First 5 |

Select @{N='VMHost';E={$_.Entity.Name}},@{N='Datastore';E={$dsTab[$_.Instance]}},Value

[SG1234]

thanks ! -- I have two requests

is it possible to differentiate between SAN and NAS datastores

also can we remove duplicate datastores - because in a given farm same Datastore will be shared across all hosts

[LucD]

Try this, it shows the datastore type as well

$stat = "datastore.sizeNormalizedDatastoreLatency.average"

$esx = Get-VMHost

$dsTab = @{}

Get-Datastore -RelatedObject $esx | %{

    $dsTab.Add($_.ExtensionData.Info.Url.Split('/')[5],$_)

}

Get-Stat -Entity $esx -Stat $stat -Realtime -MaxSamples 1 -ErrorAction SilentlyContinue |

Sort-Object -Property Value -Descending |

Select -First 5 |

Select @{N='VMHost';E={$_.Entity.Name}},

    @{N='Datastore';E={$dsTab[$_.Instance].Name}},

    @{N='Type';E={$dsTab[$_.Instance].Type}},

    Value