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Razorleaf PLM Tip - Defragmenting Virtual Machines


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Like Razorleaf, many PLM administrators use virtualization to power their test and development systems. When VM performance degrades, defragmenting virtual disks and virtual machines can help - but there are special steps to follow.

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Razorleaf PLM Tip - Defragmenting Virtual Machines

  1. 1. PLM Tip<br />Defragmenting VMs<br />
  2. 2. Why Fragmentation Slows Performance<br />File writing, moving, and rewriting splits files over time (files go in the first available space)<br />Seek time adds to overall retrieval time when reading from hard disks (seek increases when files are split)<br />Compare:<br />10msec read<br /> 5msec read + 2msec seek + 3msec read + 2msec seek + 1msec read + 2msec seek + 1msec read (15msec)<br />
  3. 3. How VM Fragmentation is Different<br />VM Fragmentation<br />Files fragmented across the virtual disk<br />Virtual disk fragmented across multiple files<br />Virtual disk files fragmented across physical disk<br />versus<br />Physical Fragmentation<br />Files fragmented across the physical disk<br />
  4. 4. Steps to Defragging VMs<br />Defrag Guest OS (Defraggler on Guest)<br />Defrag Virtual Disk (VMware Utility)<br />Defrag Host OS (Defraggler on Host)<br />
  5. 5. Defrag Guest OS<br />Moves files into contiguous areas where possible, but may not move all guest files into a single virtual disk file<br />
  6. 6. Defrag Virtual Disk<br />Consolidates virtual files making up the disk, to the greatest extend possible<br />
  7. 7. Defrag Host OS<br />Moves virtual disk files into contiguous area<br />
  8. 8. Useful Tools<br />VM defrag<br />(built-in with VMware)<br />Defraggler<br />Windows defrag<br />Diskeeper<br />