Dell PowerVault 770N (Deskside NAS Appliance) - Manual (Page 57)

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You can browse shadow copy pseudodirectories like any other directory. Permission rules are the same as for client systems
running Windows, except that client systems running UNIX with permissions when the shadow copy was taken will have
permissions to access the shadow copy.
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 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.
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