Splitting up a job for 140k+ users across multiple servers

Question

Hello, 
I am pretty new to Powershell and want to learn more about scaling stuff and just started working with jobs.
In this particular case I am just doing mass enable or disable at a per user level.  The other script I need to do this with grabs and checks values on around 6000 distribution groups and using the current values and type it creates new commands
to add/remove certain users or permissions in bulk with Invoke-Expression.  I *think* it would probably be best in my case to run these across servers as well.
Basically what I am looking at is:
Using one large list/array, counting it, splitting it, using the resources it has available with jobs.
One of the problems I have had with this but seems I have mostly figured out is how I combine or 'foreach' several different values that may need to be applied to separate objects on certain servers with certain users and certain attributes. 
Last night I ran the first script that could do that but it took me awhile and looks like a wreck I am sure - but it worked!
Now to tackle size.
Thank You

Answer 1

Hi Paul,
looking good so far. Did a little rewrite of what you posted:
Function Disable-Stuff
Param (
[Parameter(Position = 0, Mandatory = $true)]
[string]
$file,
[Parameter(Position = 1)]
[ValidateSet('CAS', 'MBX', 'ALL')]
[string]
$servertype = "CAS"
# Collect server lists
$servers = @()
switch ($servertype)
"CAS" { $servers += Get-ClientAccessServer | Select -ExpandProperty name }
"MBX" { $servers += Get-MailboxServer | select -ExpandProperty name }
"ALL"
$servers += Get-ClientAccessServer | Select -ExpandProperty name
$servers += Get-MailboxServer | select -ExpandProperty name
# Remove duplicate names (just in case)
$servers = $servers | Select -Unique
default { }
# Calculate set of operations per server
$boxes = ($servers).count
$content = Get-Content $file
$split = [Math]::Round(($content.count / $boxes)) + 1
# Create index counter
$int = 0
# Split up task
Get-Content $filepath -ReadCount $split | ForEach {
# Store file content in variable
$List = $_
# Select Server who does the doing
$Server = $servers[$int]
# Increment Index so the next set of objects uses the next Server
$int++
# Do something amazing
# ... <-- Content goes here
Disable-Stuff "c:\job\disable.txt" "CAS"
Notable changes:
Removed the test variables out of the function and added them as parameters
Modified the Parameters a bit:
- $file now is mandatory (the function simply will not run without it)
- The first parameter will be interpreted as the file path
- The second parameter will be interpreted as Servertype
- $Servertype can only be CAS, MBX or ALL. No other values accepted
- $Servertype will be set to CAS unless another servertype is specified
you if/ifelse/else construct has been replaced with a switch (I vastly prefer them but they do the same functionally
I removed the unnecessary temporary storage variables.
Appended a placeholder scriptblock at the end that shows you how to iterate over each set of items and select a new server each time.
I hope this helps you in your quest to conquer Powershell :)
Cheers,
Fred
There's no place like 127.0.0.1