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Unique Differences Between Perfectdisk 12 and Diskeeper 2011

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Unique Differences Between Perfectdisk 12 and Diskeeper 2011 Defragmentation Technology | White Paper Unique Differences Between PerfectDisk 12 and Diskeeper 2011 This paper gives an overview of the differences between PerfectDisk 12 and Diskeeper 2011 disk defragmentation software based on key areas of functionality and defragmentation methods. www.raxco.com 2 Defragmentation Technology | White Paper Table of Contents Executive Summary......................................................................................................................................................... 3 Defragmentation Performance .................................................................................................................................... 3 Effectiveness of Defragmentation .............................................................................................................................. 4 Fragmentation Prevention............................................................................................................................................. 5 Effectiveness of Fragmentation Prevention ............................................................................................................. 6 Zero Fill™ for Virtual Storage / Thin SAN ............................................................................................................. 7 Single Pass Defragmentation ....................................................................................................................................... 8 Free Space Consolidation .............................................................................................................................................. 8 Optimization Strategy ..................................................................................................................................................... 8 Diskeeper I-FAASTTM .................................................................................................................................................. 10 Centralized Management ............................................................................................................................................ 11 PerfectDisk Enterprise Console ................................................................................................................................ 11 Diskeeper Administrator Edition .............................................................................................................................. 12 Product Activation ......................................................................................................................................................... 12 Automating Defragmentation .................................................................................................................................... 12 Free Space Requirement .............................................................................................................................................. 14 Volume Shadow Copy Service (VSS) Capability Mode ...................................................................................... 14 Online Directory Consolidation ................................................................................................................................ 15 Designed for Disks of Several Terabytes ................................................................................................................ 15 MFT Placement .............................................................................................................................................................. 15 NTFS Metadata .............................................................................................................................................................. 16 Page File Defragmentation ......................................................................................................................................... 16 Selected Files Defrag .................................................................................................................................................... 16 Consolidate Free Space Defrag.................................................................................................................................. 16 GUI-less Installation ..................................................................................................................................................... 17 User Defined Thresholds ............................................................................................................................................. 17 Summary ........................................................................................................................................................................... 17 www.raxco.com 3 Executive Summary This paper provides an overview of the differences between PerfectDisk® 12 and Diskeeper® 2011 based on key areas of functionality and defragmentation methods. The process of comparing two utilities that perform a similar function (i.e. disk defragmentation and fragmentation prevention) is not necessarily a case of comparing “apples to apples,” as the two products’ philosophies and strategies, and most importantly results, differ substantially. To assert that “all defragmenters are the same” is a gross oversimplification of the issues surrounding disk defragmentation. Sure, data files need to be defragmented; but equally important is the treatment of the remaining free space. System files and metadata files that can’t be moved online are also significant since their location will affect data file defragmentation. Disk optimizing file placement strategies can also make a difference in overall performance. The goal of this paper is to discuss these key areas of functionality and compare the named products and their approaches to the problem. Users can use this paper as guidance in their own product evaluations and testing. Defragmentation Performance The most popular way to compare any two defragmentation solutions is to pit them head to head against the same drive image to determine which product returns the best results. Defragmenters must successfully defragment as many files and consolidate free space, with as little resource impact as possible. The following test was performed to compare the ability to eliminate file and free space fragmentation. It was performed on a Server 2008 R2 x64 system with a Quad Core CPU, 8GB of RAM and a 93.1GB drive partition which contained 1,915 files and 32,919 file fragments. Total file fragmentation was at 78.4% and total free space fragmentation was at 100%. While total free space was 1.51 GB (1%), the largest piece of contiguous free space was only 2.05MB. A duplicate image of the drive partition was created and restored between tests. The partition was hosted by two Seagate 1TB Hard Drives (ST31000340AS) in a RAID 0 configuration. Per the help documentation, in order to get the “best results”, Diskeeper was set to use automatic defrag, which was allowed to run for 45 hours before being disabled. PerfectDisk performed a single SMARTPlacement defragmentation pass. www.raxco.com 4 Defragmentation Technology | White Paper This test was designed to measure defragmentation effectiveness on an existing fragmented volume and was not designed to measure fragmentation prevention (see Fragmentation Prevention for those results). The test is also designed to measure the ability to eliminate free space fragmentation against marketing claims. The results show that while both offerings claim to eliminate free space fragmentation, only PerfectDisk demonstrates the ability to do so effectively. Effectiveness of Defragmentation Prior to PerfectDisk 12 Diskeeper 2011 Defragmenting Total Elapsed Processing Time 1 Hours 43 Minutes 45 hours File Fragmentation 76.20% 0.2% 56.1% Directory Fragmentation 23.10% 0% 0% Number of Fragmented Files 1339 3 1099 Total Number of Fragments 32919 4 2709 Free Space Fragmentation 93.81% 0.7% 100% Total Free Space Extents 12,478 17 1163 Largest Piece of Contiguous Free Space 93.81MB 1.3 GB 5.44 MB Despite the length of time and the amount of resources used, while Diskeeper did succeed in defragmenting some files, it was not able to consolidate free space. Given the length of time to run, total CPU usage and disk I/O generated by Diskeeper, the price paid in terms of resources was unreasonable. Given more time, Diskeeper 2011 might have produced better results than it did, but at 45 hours we felt that it had been given sufficient time to rival the results generated by PerfectDisk which completed in less than 2 hours. Another interesting note is the consolidation of free space. Write performance is negatively impacted as free space fragmentation builds up. The consolidation of free space is very important because it restores the write performance of a volume and because failure to eliminate it will result in file fragmentation that cannot be prevented by any means. For example, if your largest consolidated free space “chunk” is 500 MB in size, no amount of fragmentation prevention will allow a 1GB file to be written in anything less than 2 fragments. www.raxco.com 5 Even with optimum resources availability, Diskeeper was very slow to effectively defragment. Because it took Diskeeper an exhaustive period of time (compared to PerfectDisk) to effectively defragment the volume, its cumulative resource usage was very high. This demonstrates that while PerfectDisk also provides
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