How to extend the size of the File Classification Infrastructure System Cache

Applies to: Windows Server 2008 R2 StandardWindows Server 2008 R2 EnterpriseWindows Server 2008 R2 Datacenter More

This topic is intended to address a specific issue identified by a Best Practices Analyzer scan. You should apply the information in this topic only to computers that have had the File Services Best Practices Analyzer run against them and are experiencing the issue addressed by this topic. For more information about best practices and scans, see Best Practices Analyzer.


On a Windows Server 2008 R2, you have File Server Resource Manager (FSRM) configured. The File ClassificationInfrastructure (FCI) attaches some information to files into an alternate data stream (ADS). This storage location is also referred to as the System Cache by FCI. The System Cache location is limited to 4KB by default.

If FCI attempts to store more information, the following error is generated in the FCI classification error log:

Item FilePath="<File_Path>" Module="System Cache Storage Module" Rule="Save Properties" Message="HRESULT = 0x800700df (The file size exceeds the limit allowed and cannot be saved.)"


This issue occurs if the alternate data stream size is too small to store classification properties.


To work around this problem, you need to increase the size of the alternate data stream cache.

How to use Registry Editor to increase the size of the alternate data stream cache

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows

To have us increase the size of the alternate data stream cache for you, go to the "Fix it for me" section. If you prefer to increase the size of the alternate data stream cache yourself, go to the "Let me fix it myself" section.

Fix it for me

To increase the size of the alternate data stream cache automatically, click the Fix it button or link. Then click Run in the File Download dialog box, and follow the steps in the Fix it wizard.