Sometimes we want to apply a filter to an array or other collection of objects, but keep both the items that pass the filter and those that fail it. Instead of cycling twice through the collection, there’s a one-step method.
Instant File Initialization is a privilege assigned in the local security policy. Here’s some explanation by MSSQL Tiger Team.
There’s a lot to tell about it, but I’m not going to do that here. Let’s just assume it’s a good thing to assign that privilege to the account with which the SQL Service runs.
Klaas explains how to use Powershell filtering with Where-Object and the Where method for people new to Powershell, and then uses this to figure out if IFI is enabled.