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Windows Server 2012 – System for the Cloud

windows server 2012

Data Deduplication

Data deduplication is the option of the  file server to identify and remove duplicate information in the file without compromising the content, thereby increasing the free space on these volumes. Data recovery and data integrity are provided through processes that involve creating hash data and some protection algorithms, such as the duplication of parts of files that often appear in the volume.

To be able to use deduplication oh the data on a volume, it should not be a system or boot volume, must be formatted as NTFS (ReFS is not supported in this version), must be a fixed drive (external memory unit and floppy disks are not supported), can be iSCSI , FC (Fibre Channel) or SAS (Serial Attached SCSI) volume. Deduplication  to CSV (Cluster Shared Volumes) are also not supported. After engaging in a volume of data deduplication, the background is driven by automated process with a low priority, which processes and checks the files on it. It segments the file into pieces the size of 32-128 KB and identifies duplicates. All are dual parts of a file deleted from the hard disk and replace reference to one or more copies of the same part. In the end, all of the remaining parts  of the files are compressed in order to obtain additional free space on the disk. Initial settings are pretty intrusive process and not bother too much Server resources,  and can only handle files older than 30 days, which is of course the default deduplication can be edited. Before turning deduplication, it is appropriate to using command line applications DDPEval.exe to analyze target volume and thus get an estimate in advance to save space.

data deduplication

Microsoft has worked on the analysis deduplication vast quantities of data, and the results are visible on the graph. It is good to note that the deduplication bypass some files such as system state files, encrypted files, files with extended attributes, files smaller than 32 KB, and already optimized files. Deduplication is of course possible to include, configure and monitor with the use of PowerShell 3.0 commands.

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