Adjusting Disk Space usage in Vista

Adjusting the amount of disk space System Restore uses to hold restore points

 

The slider that Windows XP uses to adjust the amount of disk space used to store System Restores restore point is no longer available in Windows Vista. I suspect the reasons for this is that changing the amount of disk space effects more then just restore points.

 

System restore in Vista utilizes the Volume Shadow Copy Service (VSS) which manages restore points or shadow copies. A shadow copy is essentially a previous version of a file or folder at a specific point. Restore points are a special type of shadow copy because they store specific information needed during a system repair with System Restore. Shadow Copies are also created by Previous Versions, Windows Backup, and CompletePC Backup. CompletePC Backup is only available in Windows Vista Business, Ultimate, and Enterprise editions.

 

The shadow copy storage area is where all types shadow copies are stored on each volume where VSC (Volume Shadow Copy) is turned on.

 

The determination of shadow storage size is made when the first shadow copy is created (typically when System Restore is enabled and creates a restore point during Setup) and is set to the minimum of 30% of free space or 15% of the volume. When System Restore is turned on right after Windows Vista is installed, the shadow copy storage area is most likely to be 15% of volume. In cases where System Restore is turned on much later, the 30% of free space formula might kick in, thus limiting the number of shadow copies you’ll have on your system. Also, these percentages don’t increase or decrease dynamically when more (or less) free space is available or after you adjust the size of the volume.

 

So you can see that adjusting the shadow copy storage area where restore points are stored has an impact on all types of Shadow Copies. If disk space is not an issue then leave well enough alone. Performance should not be effected by changing the storage space either.

 

If the decision is made to resize, the shadow copy storage area, use the “vssadmin” command-line tool from the command prompt to do so.

 

From within an administrator account open the command prompt. To do so go to Start – All Programs – Accessories and click on the Command Prompt. It may be necessary to right click n Command Prompt and select Run as administrator.

 

To view lists existing volume shadow copies type or paste the following command then press enter:

 

vssadmin list shadows

 

Displays all shadow copy storage associations on the system and their size:

 

vssadmin list shadowstorage

 

The “vssadmin resize shadowstorage” command can be used to resize the storage area.

 

Here’s a example of the command used to resize the shadow storage area on the C:\ partition to a maximum size of 6 GB’s.

 

vssadmin resize shadowstorage /For=C: /On=C: /MaxSize=6GB

 

Note: As soon as you disable/enable SR, the original values will be back.

Related Articles

 

Vssadmin command syntax

Identifying how much disk space is used for restore points in Windows Vista

Volume Shadow Copy Scripts

 

The following VB Scripts can be used to automate some of the following tasks

 

Download a script, double click on the zip file and drag the VBS file within to the desktop or location of your choice.

 

The script code of all these VBS files can be viewed in Notepad or any text editor. Or right click on the VBS file and select Edit.

List Shadow Copy Storage Areas Max Size and Space Used

Download ZIP

List All Shadow Copy Storage Areas on a Computer

Download ZIP

WARNING: The following scripts will delete all existing Shadow Copies, Restore Points and Previous Versions in the resize process.

Change the Shadow Copy Storage area maximum size to 1 GB

Download ZIP

Change the Shadow Copy Storage area maximum size to 2 GB’s

Download ZIP

Change the Shadow Copy Storage area maximum size to 3 GB’s

Download ZIP

Change the Shadow Copy Storage area maximum size to 4 GB’s

Download ZIP

Change the Shadow Copy Storage area maximum size to 5 GB’s

Download ZIP

Change the Shadow Copy Storage area maximum size to 6 GB’s

Download ZIP

Change the Shadow Copy Storage area maximum size to 7 GB’s

Download ZIP

Change the Shadow Copy Storage area maximum size to 8 GB’s

Download ZIP

Change the Shadow Copy Storage area maximum size to 9 GB’s

Download ZIP

Change the Shadow Copy Storage area maximum size to 10 GB’s

Download ZIP

Deletes all the shadow copies stored on a computer

Download ZIP

 Top  Home  Support

 

Search This Site

Site Last updated

Friday, October 23, 2009

 

Start Date 2/27/05


View My Stats

 

Copyright © 2005 - 2009 Bert Kinney