The Unoptimization job, which is a special job that should only be run manually, undoes the optimization done by deduplication and disables Data Deduplication for that volume.Ī chunk is a section of a file that has been selected by the Data Deduplication chunking algorithm as likely to occur in other, similar files. Additionally, Data Deduplication keeps backup copies of popular chunks when they are referenced more than 100 times in an area called the hotspot. When possible, Data Deduplication can automatically use volume features (such as mirror or parity on a Storage Spaces volume) to reconstruct the corrupted data. The Integrity Scrubbing job identifies corruption in the chunk store due to disk failures or bad sectors. The Garbage Collection job reclaims disk space by removing unnecessary chunks that are no longer being referenced by files that have been recently modified or deleted. The optimization process that Data Deduplication uses is described in detail in How does Data Deduplication work?. The Optimization job deduplicates by chunking data on a volume per the volume policy settings, (optionally) compressing those chunks, and storing chunks uniquely in the chunk store. "Under-the-hood" tweaks for interop with DPM/DPM-like solutionsĭata Deduplication uses a post-processing strategy to optimize and maintain a volume's space efficiency.Virtualized backup applications, such as Microsoft Data Protection Manager (DPM) "Under-the-hood" tweaks for Hyper-V interop.Virtualized Desktop Infrastructure (VDI) servers The following Usage Types provide reasonable Data Deduplication configuration for common workloads: Usage Type Modifications to ranges of a deduplicated files get written unoptimized to the disk and are optimized by the Optimization job the next time it runs. The filter redirects the read operation to the appropriate chunks that constitute the stream for that file in the chunk store. When optimized files are read, the file system sends the files with a reparse point to the Data Deduplication file system filter (Dedup.sys).
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