Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Shadow copies using too much space

Shadow copies using too much space

Shadow copies using too much space

I am running a fileserver with Windows 2008 R2. The same problem existed on my old 2003 box.

We have a volume with about 3TB of used space. We also have Diskeeper installed, with the "shadow copy" option turned on.

I dedicated 1 TB of space to my shadow copy volume. After only 1 day's changes, there are only 300 GB free on this drive. I have disabled Diskeeper defrag to see if the next couple days yield smaller shadow copies. We only get about 20 GB a day of changes on the server, and lots of those are creation of new files, which shouldn't take up any shadow copy space (right?).

What could be the cause of this? To me, VSS is like a black box - I can't get any good description of how it works, in particular, what types of file activity causes lots of space usage on the volume where snapshots are stored.

Any ideas? Thanks.


smarty Hard work often pays off over time, but procrastination pays off right now!

RE: Shadow copies using too much space


That's a good overview of how VSS works.  Use the links on the left-hand side to browse sub-categories of the topic.

My guess is that when Diskeeper is doing it's defrag that VSS is tagging the files as having changed, causing more copies to be taken than necessary.

CompTIA A+, Network+, Server+, Security+
MCTS:Windows 7
MCSE:Security 2003
MCITP:Server Administrator
MCITP:Enterprise Administrator
MCITP:Virtualization Administrator 2008 R2
Certified Quest vWorkspace Administrator

RE: Shadow copies using too much space

Maybe - I know Diskeeper has a special less-effective defrag option that is designed not to cause extra snapshots, but I've disabled diskeeper in the meantime to see if it isn't working as advertised. Thanks for the link.


smarty Hard work often pays off over time, but procrastination pays off right now!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close