https://community.hpe.com/t5/windows-server-2003/windows-2003-storage-server-r2-single-instance-issue/m-p/4166150#M4891 Server - Ml310 G4 running windows 2003 storage server R2 with sp1 , it is using sis common storage file system. <BR /><BR />when backing up data to tape using backupexec , backup is fine but when restoring data , if data is restored to a another location other than the original location some files are corrupted. If restored to their original location they are ok. <BR /><BR />This is due to the single instance storage file system of the storage server. Is there anything i can do to allow succesfull restoration of data to a redirected location.<BR /><BR />Ntbackup works fine. Tried restoring to another server on the network still same error.<BR /><BR />It is the SIS file system. <BR /><BR />Open to suggestions/recommendations / advice.<BR /><BR />Thank you<BR /><BR />kumar Sun, 23 Mar 2008 11:42:14 GMT MKumar Nagappa 2008-03-23T11:42:14Z https://community.hpe.com/t5/windows-server-2003/windows-2003-storage-server-r2-single-instance-issue/m-p/4166150#M4891 Server - Ml310 G4 running windows 2003 storage server R2 with sp1 , it is using sis common storage file system. <BR /><BR />when backing up data to tape using backupexec , backup is fine but when restoring data , if data is restored to a another location other than the original location some files are corrupted. If restored to their original location they are ok. <BR /><BR />This is due to the single instance storage file system of the storage server. Is there anything i can do to allow succesfull restoration of data to a redirected location.<BR /><BR />Ntbackup works fine. Tried restoring to another server on the network still same error.<BR /><BR />It is the SIS file system. <BR /><BR />Open to suggestions/recommendations / advice.<BR /><BR />Thank you<BR /><BR />kumar Sun, 23 Mar 2008 11:42:14 GMT https://community.hpe.com/t5/windows-server-2003/windows-2003-storage-server-r2-single-instance-issue/m-p/4166150#M4891 MKumar Nagappa 2008-03-23T11:42:14Z https://community.hpe.com/t5/windows-server-2003/windows-2003-storage-server-r2-single-instance-issue/m-p/4166151#M4892 An old article but still valid I think<BR /><A href="http://support.microsoft.com/kb/299726" target="_blank">http://support.microsoft.com/kb/299726</A><BR /><BR />Basically on your source volume there will be 3 important components:<BR />1) A Groveler service that finds duplicate files and replaces duplicate files with a pointer to the "Master file" that is moved to a common folder<BR />2) The SIS Common Store folder itself that is a hidden folder<BR />3) A SIS filter driver that handles the access to the duplicate files. <BR /><BR />Without 2 or 3 the duplicate files will indeed look like 0-length corrupted files.<BR /><BR />The reason you do not get any problems restoring to the original location is probably because the hidden folder is there and the SIS filter driver is active.<BR /><BR />Note however that if your backup does not include the hidden folder, you may effectively be fooling yourself into thinking you have a valid backup, when you are actually missing an essential piece...<BR /><BR />A work-around for backup purposes could be to backup via a network share as described here: <A href="http://support.microsoft.com/kb/889714" target="_blank">http://support.microsoft.com/kb/889714</A><BR /><BR /><BR />Cheers,<BR />Rune<BR /> Fri, 11 Apr 2008 05:44:57 GMT https://community.hpe.com/t5/windows-server-2003/windows-2003-storage-server-r2-single-instance-issue/m-p/4166151#M4892 Rune J. Winje 2008-04-11T05:44:57Z