I got a third party software (Evault) that use VSS to create fullbackup. 

Sometimes fullbackups fails on one job with alot of changes during fullbackup.

The shadow copies of volume D: were deleted because the shadow copy storage could not grow in time.  Consider reducing the IO load on the system or choose a shadow copy storage volume that is not being shadow copied.

volsnap event id 25.

 I have change the setting:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VolSnap  

 MinDiffAreaFileSize to 3000. 

Something more I could do? Local disk is all SSD. Server is running Windows 2008 R2/SQL 2008 R2 Enterprise.

Hi,

First please run a check disk on drive D.

Also make sure the Shadow Copy Storage is larger than 3GB as you set the Mindiffareafilesize to 3GB.

If issue still exists, please monitor the disk which contain Drive D - if the I/O is really high, move shadow copy storage to another disk should help on this issue.