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10月13日

Pass-through Vs VHD

By default we all (and should) use virtual hard drive (VHD) files to run virtual machines in a Hyper-V environment. But Hyper-V based virtual machines can also attach itself directly to physical disks (pass-through disks). Following are the factors to be considered before deciding to use pass-through disks.

  • Studies have shown that VHD performance can be as high as 97% of native disk performance in terms off IOPS (http://www.qlogic.com/promos/products/hyper-v.aspx ). So the question is do you really need to use pass- through disks to achieve high performance or can you optimize the performance by following the best practices around VHD
  • Pass-through disks do not support virtual machine snap shots, dynamically expanding hard disks and differencing hard disks
  • A single VHD has a maximum capacity limit of 2TB.  Size of a pass-through disk can be bigger than this
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SankarRavi发表:
I can think of only one scenario where pass-through disk is useful, when someone practically obseerve that VHD throughput is not enough for the whatever workload they are having.
The 2TB size limit could be another reason to use pass-through disk. But this is strictly not true as Windows 7/2008 R2 seamlessly allows extension of logical drive letter to another VHD(or even physical drive)
10 月 15 日
Nice Post Sir,

So, here i'm excited to know that
"how we can do this & in which scenario/Infrastructure we can use this Pass-through in place of VHD".

I'll be happy to hear from you soon.

-Rishi
10 月 14 日

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