VMware

Performance metric from VC if there is a performance issue on environment

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Connect to vCenter (update credentials as needed)

Connect-VIServer -Server “your-vcenter-server”

Define time window for stats (last 30 minutes)

$start = (Get-Date).AddMinutes(-30)
$end = Get-Date

Filter VDI VMs (update identification logic as appropriate)

$vdimvms = Get-VM | Where-Object { $_.Name -like “VDI” -and $_.PowerState -eq “PoweredOn” }

Collect performance data

$results = foreach ($vm in $vdimvms) {
# Gather stats in batch for efficiency
$stats = Get-Stat -Entity $vm -Stat @(
“cpu.ready.summation”,
“mem.latency.average”,
“disk.totalLatency.average”,
“disk.read.average”,
“disk.write.average”
) -Start $start -Finish $end

# Extract and average metrics; protect against missing data
$cpuReady   = $stats | Where-Object {$_.MetricId -eq "cpu.ready.summation"}
$memLatency = $stats | Where-Object {$_.MetricId -eq "mem.latency.average"}
$diskLat    = $stats | Where-Object {$_.MetricId -eq "disk.totalLatency.average"}
$readIOPS   = $stats | Where-Object {$_.MetricId -eq "disk.read.average"}
$writeIOPS  = $stats | Where-Object {$_.MetricId -eq "disk.write.average"}

[PSCustomObject]@{
    VMName        = $vm.Name
    CPUReadyMS    = if ($cpuReady)   { ($cpuReady | Measure-Object -Property Value -Average).Average / 1000 } else { $null }
    MemLatencyMS  = if ($memLatency) { ($memLatency | Measure-Object -Property Value -Average).Average }    else { $null }
    DiskLatencyMS = if ($diskLat)    { ($diskLat | Measure-Object -Property Value -Average).Average }       else { $null }
    ReadIOPS      = if ($readIOPS)   { ($readIOPS | Measure-Object -Property Value -Average).Average }      else { $null }
    WriteIOPS     = if ($writeIOPS)  { ($writeIOPS | Measure-Object -Property Value -Average).Average }     else { $null }
    TotalIOPS     = (
        ((($readIOPS | Measure-Object -Property Value -Sum).Sum) +
         (($writeIOPS | Measure-Object -Property Value -Sum).Sum))
    )
}

}

Display top 10 VMs by disk latency, show table and export to CSV

$timestamp = Get-Date -Format “yyyyMMdd_HHmmss”
$top10 = $results | Sort-Object -Property DiskLatencyMS -Descending | Select-Object -First 10
$top10 | Format-Table -AutoSize
$results | Export-Csv -Path “VDI_VM_Perf_Report_$timestamp.csv” -NoTypeInformation

Notes:

– For environments with large VM counts, consider running data collection in parallel using Start-Job/Runspaces.

– Always verify metric names using Get-Stat -IntervalMins 5 -MaxSamples 1 -Entity (Get-VM | Select-Object -First 1).

– Add additional VM filters (folders/tags) for more targeted results.

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