Is there any Faster method to do WMI query from Powershell ..? - powershell

Question

Wrote a small script to find the number Multipaths from the windows servers using WMI query. It works well for the servers which can connect directly without any issue. But if one server is pingable but not able to reach through WMI script, it takes long time to return the error ( for example if a linux server hostname is present in the servers.txt list).. Can somebody help me to do the same in a faster way..?
$Servers = Get-Content .\Servers.txt
$ErrorActionPreference = ‘SilentlyContinue’
FOREACH ($Server in $Servers) {
Write-Host $Server -nonewline
if (test-connection -computername $Server -Count 1 -quiet) {
$Name = $null
$NoPath =$null
$MPIODisks =$null
$MPIODisks = Get-WmiObject -Namespace root\wmi -Class mpio_disk_info -ComputerName "$Server" |Select-Object "DriveInfo"
if ($MPIODisks -eq $Null) {
write-host "`t - Unable to connect" -fore "RED"
} else {
write-host ""
write-host "Drive Name `tNo.Path" -fore "yellow"
Foreach ($Disk in $MPIODisks) {
$mpiodrives = $disk.DriveInfo
foreach ($Drive in $mpiodrives) {
$Name = $Drive.Name
$NoPath = $Drive.Numberpaths
If ($NoPath -lt 4) {
Write-Host $Name `t -nonewline
write-host $NoPath -fore "Red"
} else {
Write-Host $Name `t -nonewline
write-host $NoPath -fore "Green"
}
}
}
}
write-host ""
} else {
write-host "`t- Unknown Host" -fore "Red"
write-host ""
}
}

Answer 1

There is a connect item for Get-WmiObject to add a timeout parameter. A workaround noted in that item is to just pipe your WMI command to Wait-Job and specify a timeout period in seconds.
As long as your on PS version 3.0 or higher, this should work for you:
Get-WmiObject win32_computersystem -ComputerName <hostname> -AsJob | Wait-Job -Timeout 10 | Receive-Job

Answer 2

As an alternative, you could ask all servers for the result at once by passing them all into the query and avoiding the slow loop querying one server at a time. I don't have any MPIO drives to test with, but it could look something like this (using Get-Ciminstance which takes a timeout parameter):
$servers = Get-Content .\Servers.txt
# Get data from all servers with timeout
$servers_ok = Get-CimInstance -computername $servers -Namespace root\wmi -Class mpio_disk_info -ErrorAction SilentlyContinue -OperationTimeoutSec 1 | group pscomputername
# Output which servers gave no result back
foreach($no_result in $($servers | where { $_ -NotIn $servers_ok.Name })) {
write-host "No result for $no_result" -ForegroundColor Red
}
# Loop over the results and output
foreach($server in $servers_ok) {
Write-Host $server.Name
foreach($mpiodisk in $server.group)  {
$mpiodrives = $mpiodisk.DriveInfo
foreach ($mpiodrive in $mpiodrives) {
$name = $mpiodrive.Name
$noPath = $mpiodrive.NumberPaths
If ($NoPath -lt 4) {
write-host $name `t -nonewline
write-host $noPath -fore "Red"
} else {
write-host $name `t -nonewline
write-host $noPath -fore "Green"
}
}
}
}