Article ID: 299726
This article describes the functions of the Groveler service and the Single Instance Storage Filter, what practices to avoid, and the recommended backup and restore procedures for the data that resides on a Single Instance Store (SIS) volume.
The Groveler ServiceThe Groveler service scans the hard-disk volumes on a Remote Installation Services (RIS) server for duplicate copies of files. If the service locates duplicate copies of files, one instance of the duplicate file is stored in a central folder, and the duplicates are replaced with a link (a reparse point) to the central copy to improve disk usage. If you stop this service, the files cannot be automatically linked, but the existing linked files can still be accessible.
NOTE: If you remove RIS from a Windows 2000-based computer, only the Groveler service is removed or disabled. When the Groveler service is either removed or disabled, it can prevent any future files that are copied to the volume from being copied to the SIS Common Store database folder and it can prevent the creation of a link (reparse point) to that data in the SIS database. By default, Windows 2000 does not remove or disable the Single Instance Storage Filter that can enable you to access the data in the SIS volume when RIS is removed.
The Single Instance Storage FilterThe Single Instance Storage Filter is a file system filter that manages the duplicate copies of files on hard-disk volumes. This filter copies one instance of the duplicate file into a central folder, and the duplicates are replaced with a link to the central copy to improve disk usage. This service (Single Instance Storage Filter) cannot be stopped. If this service is disabled, the linked files are not accessible. If the central folder is deleted, the linked files can become permanently inaccessible.
The Backup and Restore Procedures of Data Stored on a SIS VolumeIt is recommended that you perform regular backups of critical data before you make any system changes or you install any services, especially those services that can interact with data.
To be able to access data that is stored on a SIS volume, you must either run or have installed Single Instance Storage Filter on your computer. The Single Instance Storage Filter driver is not installed by default on a new installation of Windows 2000 Server. This driver is only installed when the RIS is installed by means of the Add/Remove Programs tool (click Windows Components).
Recommended vs Not Recommended Practices