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PowerScale OneFS 9.5.0.0 Web Administration Guide

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File and directory restoration

You can restore the files and directories that are referenced by a snapshot alias. You can copy the data from the snapshot, clone a file from the snapshot, or revert the entire snapshot.

Copying a file from a snapshot duplicates the file, which roughly doubles the amount of storage space consumed. Even if you delete the original file from the nonsnapshot directory, the copy of the file remains in the snapshot.

Cloning a file from a snapshot also duplicates the file. However, a clone does not consume additional space on the cluster unless the clone or cloned file is modified.

Reverting a snapshot replaces the contents of a directory with the data that is stored in the snapshot. Before a snapshot is reverted, SnapshotIQ creates a snapshot of the directory that is being replaced, which enables you to undo the snapshot revert later. Reverting a snapshot can be useful if you want to undo many changes that you made to files and directories. If new files or directories have been created in a directory since a snapshot of the directory was created, those files and directories are deleted when the snapshot is reverted.

NOTE:If you move a directory, you cannot revert snapshots of the directory that were taken before the directory was moved. Deleting and then re-creating a directory has the same effect as a move. You cannot revert snapshots of a directory that were taken before the directory was deleted and then re-created.

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