Get-MailboxExportRequest script causes high cpu utilization

Question

Our Exchange configuration is as follows:
Exchange 2013 Ent on single server with 4 dbs
DB1 - 191 users
DB2 - 19 users
DB3 - 72 users
DB4 - 7 users
When I run a script that exports all of the users from each db to a pst file the CPU utilization peaks as expected, however DB1 never completes.  Is there a way to throttle the performance somewhat or limit the number of users the script processes at
a time?  Here is my script:
#Establish variables
$mailserver = "Exchange"
$path = "\\FileServer"
$userlist = Get-Mailbox -database DB1
$ReportShare = "\\FileServer\pst$\reports"
$file = "\\FileServer\pst$\reports\*.txt"
$SMTP = "smtp.domain.com"
#delete files from previous nights export
if (Test-Path $file)
Remove-Item $file
#Clear previously completed & failed tasks
Get-MailboxExportRequest | where {$_.status -eq "Completed"} | Remove-MailboxExportRequest -confirm:$false
Get-MailboxExportRequest | where {$_.status -eq "Failed"} | Remove-MailboxExportRequest -confirm:$false
#Perform Mailbox Export
foreach ($user in $userlist)
$useralias = $user.alias
New-MailboxExportRequest -Mailbox $useralias -filepath $path\pst$\$useralias.pst
#Create a loop which checks if the task has completed or not
$exstat = Get-MailboxExportRequest | Get-MailboxExportRequestStatistics | where {$_.status -eq 'inprogress'}
do {start-sleep -seconds 5; $exstat = Get-MailboxExportRequest | Get-MailboxExportRequestStatistics | where {$_.status -eq 'inprogress'}}
until ($exstat.percentcomplete -eq '100')
#Create a pause for the exports to finish before writing logfile output
start-sleep -seconds 7200
#Write output to a log file
if ($ReportShare)
Write-Output "Writing reports to $($ReportShare)"
$Completed = Get-MailboxExportRequest -BatchName $BatchName | Where {$_.Status -eq "Completed"} | Get-MailboxExportRequestStatistics | Format-List
if ($Completed)
$Completed | Out-File -FilePath "$($ReportShare)\$($BatchName)_Completed.txt"
$Incomplete = Get-MailboxExportRequest -BatchName $BatchName | Where {$_.Status -ne "Completed"} | Get-MailboxExportRequestStatistics | Format-List
if ($Incomplete)
$Incomplete | Out-File -FilePath "$($ReportShare)\$($BatchName)_Incomplete_Report.txt"
#Send a mail notification the task has completed
Get-ChildItem $ReportShare | where {-NOT $_.PSIsContainer} | foreach {$_.fullname} | Send-MailMessage -to "[email protected]" -from "[email protected]" -Subject "PST EXPORT REPORT DB1" -Body "Export of DB1 complete."
-SmtpServer $SMTP -BodyAsHtml

Answer 1

I have to ask why you have a nightly job that exports each mailbox to PST?  It's unusual.
Anyway, you could split your script as follows:
Get-Mailbox -Database DB1 | ? {$_.samaccountname -like "[a-m]*"}
Get-Mailbox -Database DB1 | ? {$_.samaccountname -like "[n-z]*"}
Tony www.activedir.org Blog: www.open-a-socket.com