Get a Close Global Catalog Server with PowerShell

I have been writing a script which does a lot of AD queries to find computer OUs.  I wanted to do this on a close Global Catalog Server.  Here is the function I wrote to get this:

Function Get-CloseGC{
    #Requires -version 3
    #requires -module ActiveDirectory
    #it doesn't really require version 3 if you have AD module, but v2 
    #doesn't understand Requires -module

    Import-Module ActiveDirectory
    #Get this computer's AD site using .NET
    $mySite = [System.DirectoryServices.ActiveDirectory.ActiveDirectorySite]::GetComputerSite()
    #Get the DNS Root domain
    $ADRoot = $(Get-AdDomain).DNSRoot
    #Get enabled DCs which are GCs in MySite
    [array]$DomainGCs = Get-ADDomainController -server $ADRoot `
     -Filter {(Enabled -eq $true) -and (IsGlobalCatalog -eq $true)}
    #Get GCs for this computer's AD site

    [array]$MyGCs = $DomainGCs | Where-Object {$_.Site -eq $mySite}

    #Get GC for mySite, if none available, pick first returned from DomainGCs
    if ($MyGCs -ne $null) {
        return $MyGCs[0].HostName
    }ELSE{
        Return $DomainGCs[0].HostName
    }
}

									

Updated to take into account instances where a site GC is not available.

Update: 12/30/13:  I spent some real world time with this code and was disappointed.  I got better results by setting the server identity to just a domain name.  Your mileage may vary…