arachnaut Posted July 13, 2008 Report Share Posted July 13, 2008 I have been having a problem that occurred just recently after I cloned my 200Gb system drive to a larger 1TB drive. At the time it first occured a few weeks ago I was on Retrospect 7.5, but now I am using 7.6. The error is the same. I sometimes get an error that Open File Backup can't start. At that time an error is logged: Event Type: Error Event Source: VolSnap Event Category: None Event ID: 20 Date: 6/10/2008 Time: 11:58:36 AM User: N/A Computer: KRELL Description: The shadow copy of volume G: was aborted because of a failed free space computation. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 00 00 00 00 02 00 58 00 ......X. 0008: 00 00 00 00 14 00 06 c0 .......À 0010: 00 00 00 00 9a 00 00 c0 ....?..À 0018: 00 00 00 00 00 00 00 00 ........ 0020: 00 00 00 00 00 00 00 00 ........ I am using Windows XP SP3. This error occurs randomly, and a restart fixes it. It happens at the start of the backup right after the 'Starting Open File Backup' message appears. I have plenty of free space on G: (over 750 GB). G: is one partition on the 1TB drive. Since I never saw this before the upgrade to 1TB I wonder if the free space calculation is getting some type of overflow error? The older disk was partitioned in the same proportion with the same partition names. The number of files hasn't changed very much and the errors appeared right after the new drive was installed. I have run chkdsk thoroughly - no bad blocks. Disk diagnostics show nothing. Nothing unusual in the SMART data. The disk is not fragmented. I use this system heavily and it is quite stable. Computer is an HP Pavilion with AMD Athlon 64 X2 Dual core 4200+. 2 MB of RAM. Windows XP SP3 with all recent updates. I have posted this question on MS forums and some others, but got no helpful response so far. Quote Link to comment Share on other sites More sharing options...
Mayoff Posted July 13, 2008 Report Share Posted July 13, 2008 Retrospect uses the microsoft VSS Services. They are failing on your computer with Event ID: 20 errors. The error sounds to me like a directory problem on the drive letter. Quote Link to comment Share on other sites More sharing options...
arachnaut Posted July 15, 2008 Author Report Share Posted July 15, 2008 Thank you for the response. I am not using any software that needs VSS - no databases or anything like that. I do have PerfectDisk 2008 set up to run defragmentation in VSS compatible mode, and I set it that way mainly because I knew Retrospect uses that. But frankly, I don't know much about the innards of VSS or how the document sets are linked. I just changed the setting to be 'Stop if shadow copies exist' just in case. Since it is a new drive I have been running PerfectDisk on it quite a lot. By running in VSS compatible mode is PerfectDisk making thousands of shadow copies of files - one for every defrag? I don't know if there is some interaction going on here. Maybe I should ask in the PerfectDisk forum? Can someone shed a little enlightenment on this? Quote Link to comment Share on other sites More sharing options...
Mayoff Posted July 15, 2008 Report Share Posted July 15, 2008 I don't know if there is some interaction going on here. Maybe I should ask in the PerfectDisk forum? Probably a good idea. Have you tried using perfect disk using all default settings? Quote Link to comment Share on other sites More sharing options...
arachnaut Posted July 19, 2008 Author Report Share Posted July 19, 2008 (edited) In Retrospect 'Manage Scripts' under Edit and in the Backup window under Options select 'more choices'. There I set 'Stop when open files cannot be backed up'. Then in PerfectDisk 2008 I set VSS mode to 'Stop if any shadow copies exist'. Since I'm not using Shadow copies (to my knowledge) this should have no affect. It does seem to make the problem go away. It was a random event, and I haven't seen it happen again since I made the change. Nothing else seems to be affected. If I see anything happen I'll post something later. Edited July 19, 2008 by Guest Quote Link to comment Share on other sites More sharing options...
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