Ran into an issue where I was seeing the following message in my Status Messages for a Configuration Manager 2012 Site.

Inventory Data Loader failed to process the file C:\Program Files\Microsoft Configuration Manager\inboxes\auth\dataldr.box\Process\H23G5WPJ.MIF because it is larger than the defined maximum allowable size of 5000000.

Solution: Increase the maximum allowable size, which is defined in the registry key HKLM\Software\Microsoft\SMS\Components\SMS_INVENTORY_DATA_LOADER\Max MIF Size (the default is 5 MB), and wait for Inventory Data Loader to retry the operation.

After some Google-Fu I came across this Blog that explains how to fix it step by step.

http://be.enhansoft.com/post/2013/12/10/Change-the-Maximum-File-Size-of-Management-Information-Files-(MIF)-in-SCCM-2012.aspx