In part, this hotfix is designed to improve the performance of the default shadow copy driver (Volsnap.sys) when there are high input/output levels. The hotfix also includes a larger initial size for the shadow copy storage area: 300 MB instead of 100 MB.

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Fixes an issue that generates a "0x0000007E" Stop error.

Fixes an issue in which the cluster service takes longer than expected to bring a CSV volume online in Windows Server 2012 R2. This issue occurs when logs of VSS snapshots are accumulated by the Volsnap provider.

This issue occurs because the Volsnap.sys driver file cannot create the difference area on a volume that is larger than 16 terabytes (TB) during concurrent volume shadow copy operations.

This issue occurs because of a race condition in the Volume Shadow Copy Service driver (Volsnap.sys). When the volume size is being changed in the snapshot creation process, the race condition might be encountered.

This problem occurs because the Volume Shadow Copy driver (Volsnap.sys) tries to access a deleted snapshot object. A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article.

To apply this hotfix, you must be running Windows Server 2008 R2. To use the hotfix, you do not have to change the registry. You do not have to restart the computer after you apply this hotfix. This hotfix does not replace a previously released hotfix.