Using PowerCLI to get VM Disk Stats

Hi LucD,

Firstly - thanks for a great selection of posts on Reporting vSphere from Powershell - Well worth the time and a worth read for anyone.

I'm certainly not any good at PowerShell - but I was able to understand and make some changes for my benefit - so I figured I'd share my results and ask a couple of questions.

With your script as a basis - I've been able to come up with the following that SHOULD allow me to review ALL VMs in VC one at a time collect virtual disk stats for the VMs various disks, (IOPS, Throuput & Latency) I'm using VC 4.1 and and the storage is NFS attached, I believe these stats are OK but would appreciate your insight on this.

I'm quite pleased with the script - but it needs more testing on a valid site, rather than my small test area, but I'm sure from a 'PS' perspective there is more efficiency to be gained.

Firstly - is there any way of getting all the stats at once - rather than doing 6 calls per VM? (I'm also sure the '+=' one stat the the next can not be ideal)

Also - is there a way can control the output to the CSV, it seems to put colums in any order it likes and layout does not seem to be related to the group object command? Can this be controlled so I can have the 'value' and 'unit' entries next to each other?

Any insight and assistance would be appreciated, and I hope others will give it a test and let me know if it works for them too.

Thanks again for the inspiration and insight that got me this far

Tony.

ESX 4.1, VC 4,1, PShell 2.0, PowerCLI 4.1.1

# Main Variables

$sVCentre = "VC IP"

$sVCUser = "administrator@domain"

$sVCPwd = "password"

$strVMWildCard = "*"

$strCSVName = "Stats-AvgVMDiskWriteStatsWorkingday"

$strCSVLocation = "c:\"

# define the start and finish times for a working day.

$today9am = (Get-Date -Hour 9 -Minute 0 -Second 0)

$today5pm = (Get-Date -Hour 17 -Minute 0 -Second 0)

$intStartDay = -1

$intEndDay = -1

## Begin Script

#Connect to VC

Connect-VIServer $sVCentre -User $sVCUser -Password $sVCPwd -ea silentlycontinue

$arrVMs = Get-VM | where-object {$_.Name -like $strVMWildCard}

foreach ($strVM in $arrVMs)

{

Write-Host "Getting Stats for : " $strVM.Name

Write-Host " - collating Write latency Stats"

$stats += Get-Stat -Entity $strVM -Stat virtualDisk.totalWriteLatency.average -Start $today9am.AddDays($intStartDay) -Finish $today5pm.AddDays($intEndDay)

Write-Host " - collating Read latency Stats"

$stats += Get-Stat -Entity $strVM -Stat virtualDisk.totalReadLatency.average -Start $today9am.AddDays($intStartDay) -Finish $today5pm.AddDays($intEndDay)

Write-Host " - collating Read IOPS Stats"

$stats += Get-Stat -Entity $strVM -Stat virtualDisk.numberReadAveraged.average -Start $today9am.AddDays($intStartDay) -Finish $today5pm.AddDays($intEndDay)

Write-Host " - collating Write IOPS Stats"

$stats += Get-Stat -Entity $strVM -Stat virtualDisk.numberWriteAveraged.average -Start $today9am.AddDays($intStartDay) -Finish $today5pm.AddDays($intEndDay)

Write-Host " - collating Read Throughput Stats"

$stats += Get-Stat -Entity $strVM -Stat virtualDisk.read.average -Start $today9am.AddDays($intStartDay) -Finish $today5pm.AddDays($intEndDay)

Write-Host " - collating Write Throughput Stats"

$stats += Get-Stat -Entity $strVM -Stat virtualDisk.write.average -Start $today9am.AddDays($intStartDay) -Finish $today5pm.AddDays($intEndDay)

Write-Host $stats.length

# group the data and collate the stats into averages for the day.

}$groups = $stats | Group-Object -Property {$_.Entity, $_.MetricId, $_.Instance}

$report = $groups | % {

New-Object PSObject -Property @{

Description = $_.Group[0].Description

Entity = $_.Group[0].Entity

EntityId = $_.Group[0].EntityId

Instance = $_.Group[0].Instance

MetricId = $_.Group[0].MetricId

Timestamp = $_.Group[0].Timestamp.Date.AddHours($_.Group[0].Timestamp.Hour)

Unit = $_.Group[0].Unit

Value = [math]::Round(($_.Group | Measure-Object -Property Value -Average).Average, 2)

}

}

#Exporting the report to a CSV file.

$strCSVSuffix = (get-date).toString('yyyyMMddhhmm')

$strCSVFile = $strCSVLocation + $strCSVName + "_" + $strCSVSuffix + ".csv"

$report | Export-Csv $strCSVfile -NoTypeInformation -UseCulture