Wednesday, March 12, 2014

Everyday Powershell - Part 16 - Monitoring Disk Performance in Powershell

Welcome back to another Everyday Powershell post. It's not powershell we POST every day, it's powershell you could USE everyday.

Today we look at get-counter which you should have a fiddle with if you get the chance. It does a lot more than what we've used it for here. But this may help you get the gist of running performance counters in powershell.

$disks = Get-WmiObject win32_logicaldisk | Where-Object {$_.DriveType -eq 3| select DeviceID
$report = @()
foreach ($disk in $disks)
    Write-Progress -Activity "Mesuring disk performance" -Status $disk.DeviceID -PercentComplete (($i/$disks.Count)*100)
    $temp = "" | select Disk, Read, Write
    $temp.disk = $disk.deviceid
    $counter = "\LogicalDisk(" + ($disk.deviceid) + ")\Avg. Disk sec/Read"
    $ = ((Get-Counter -Counter $counter).CounterSamples.cookedvalue)*1000
    $counter = "\LogicalDisk(" + ($disk.deviceid) + ")\Avg. Disk sec/Write"
    $temp.write = ((Get-Counter -Counter $counter).CounterSamples.cookedvalue)*1000
    $report += $temp

We've included the now ubiquitous write-progess to give a useful progress indicator. As well as the old $temp="" | select which sets up a hash table for us to dump data into.

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