Dell PowerVault 745N - Manual (Page 38)

Defragmenting a Volume Containing Shadow Copies
Defragmenting the source volume causes the difference file to increase. If the difference file increases beyond the allocated space, you might lose previous
versions of some files. Even with a 16 KB cluster size, the shadow copy difference file will increase. If the difference increases too much (greater than the
maximum set), shadow copies will be deleted.
If you do not have to keep shadow copies, delete them before defragmenting to improve the performance of the defragmentation. See " Deleting a Shadow
Copy ."
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