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Hyper-V Scalability Evident in Its New Virtual Disk Format

Hyper-V Scalability Evident in Its New Virtual Disk Format

Microsoft’s Hyper-V 2012 includes a number of new features that improve its scalability.  Among the most exciting of these features is the new virtual disk format, called VHDX.

Here are some of the interesting features I’ve seen while looking at Hyper-V 2012 as well as reading through VHDX technical specifications.

  • VHDX supports a maximum disk size of 64 TB, whereas the limit on the older, VHD format, was 2TB.
  • Disk writes are first logged to an intent log in a metadata area prior to changes being written to their final disk location.  This provides increased protection from data corruption in case of power failure.  After recovery from power-failure, any changes that were in progress will be in the intent log and changes will be replayed from these logs.
  • The new disk format supports a large 4KB logical sector size, and block sizes for virtual disks up to 256 MB; this allows for tuning of the block size to match the disk write patterns of the applications running in the VM.
  • VHDX includes support for trim/unmap operations.  These operations improve the efficiency of VHDX disks by allowing the physical…

To learn more and to read the entire article at its source, please refer to the following page, Hyper-V Scalability Evident in Its New Virtual Disk Format- Hyper-V Backup | Unitrends Blog



Unitrends Unitrends increases uptime and confidence in a world in which IT professionals must do more with less. Unitrends leverages high-availability hardware and software engineering, cloud economics, enterprise power with consumer-grade design, and customer-obsessed support to natively provide all-in-one enterprise backup and continuity. The result is a “one throat to choke” set of offerings that allow customers to focus on their business rather than backup.

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