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How to restore a volume that is managed by Single Instance Storage
Article ID: 263027 - View products that this article applies to.
This article was previously published under Q263027
When you install Remote Installation Service (RIS) on a computer, you also set up Single Instance Storage (SIS) on a volume of the hard disk drive. SIS reduces the amount of space in a volume that data uses by removing duplicate files and placing them in a common store directory (\Sis Common Store), which is a hidden directory in the root directory of the volume. When you run Risetup.exe to complete the installation of RIS, you choose an NTFS file system volume on which to store your images. You install the SIS filter on this volume.
When you restore a volume that is managed by SIS, you must follow specific steps to prevent corruption of the data you are restoring. Also, because SIS manages the entire volume, not just the RIS directory structure, SIS will manage any data that you place on this volume.
Note: To successfully restore a SIS-managed volume, the SIS/Groveler must be running and attached to the volume to which you are restoring data. If it is not, any non-SIS-linked files will still be accessible, but SIS-linked files will not be accessible, and they will appear to be corrupted. The name and size of a SIS-linked file will appear as normal. However, the file will be a zero-length file because it will not have access to the data it should contain.
If your computer is running RIS, and you are restoring only the volume in which RIS images were stored, (due to disk drive failure, installation of a larger had drive, or similar circumstances), follow these steps:
If RIS is not installed on the system because the server is being rebuilt, or the images are being moved to a new server, follow these steps:
When you install SIS, you also install Sisbkup.dll. Your backup program can call this DLL when backing up or restoring a SIS-managed volume so that the data is handled properly. You must modify your backup program to call this DLL.
If your backup program does not call Sisbkup.dll, your program will back up all of the data on the volume, the data will require more storage space on the tape than it uses on the volume, and when you restore the volume from the tape, the files will be restored as non-Sis-linked files.