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Volume Shadow Copy : how do you get this damn thing to work!

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Armando:
Strangely, when I reboot it works : I'm able to backup opened files, and then, after resuming from standby, won't work again (stopping and restarting VSS won't work either - only reboot). I'll have to enquire.

Armando:
I think I found something which could be linked to my problem. Doesn't explain the standby thing though.  :(

When you try to create shadow copies on large volumes that have a small cluster size (for example, less than 4 kilobytes [KB]), or if you take snapshots of several very large volumes at the same time, the VSS software provider may use a larger paged pool memory allocation during the shadow copy creation than is required. If there is not sufficient paged pool memory available for the allocation, the shadow copy cannot complete and may cause the loss of all previous shadow copy tasks.
--- End quote ---

this is the error I get :

Event Type:   Error
Event Source:   VolSnap
Event Category:   None
Event ID:      20
Description:
The shadow copies of volume X: were aborted because of a failed free space computation.
--- End quote ---

http://support.microsoft.com/?scid=kb%3Ben-us%3B833167&x=10&y=7

The problem is that the fix is for windows 2003 Server. I have XP home.

Anybody has ever experienced changing the cluster size of a partition?
Currently, I'm at 4kb, which doesn't seem too low...

Armando:
I'm progressing : I found that thread : http://www.petri.co.il/forums/showthread.php?p=108265

am using Windows XP SP3.

I have just upgraded my system disk from 200GB to 1TB and cloned all the software to proportionately larger partitions.

Retrospect 7.5 was working fine until then. Now this appears.

A restart fixes the problem.

It looks like it must have something to do with the large number of clusters.

My error log event is identical:

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.
--- End quote ---

But there's no solution.

Armando:
I guess I'm looking on some advices on cluster size. That's the only potential solution I foresee for now. Anyone knows from experience what will happen if I increase the cluster size of my partitions?

mwb1100:
I guess I'm looking on some advices on cluster size. That's the only potential solution I foresee for now. Anyone knows from experience what will happen if I increase the cluster size of my partitions?
-Armando (September 16, 2008, 03:05 PM)
--- End quote ---
Not from experience, but the thing that comes first to mind is make sure you're adequately backed-up.  While I think the conversion should be safe, since it's a low-level change if there's any kind of glitch it'll be a disaster.

The only drawback I believe you might see is there will be increased 'slack' space usage, especially if you have a ton of small files.  However, given today's disk sizes, I doubt that would be of any significance.

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