Deduplication combined with differencing disks for better or not ?

    We have a test hyper-V for various VMs. It is naturally easier for us to start from Parent disk which is sys prepped and move on.
    On the other hand, deduplication(2012 R2) claims to be most effective on VHD library data.
    Is the effectiveness of deduplication different when it comes to differencing VHDs as compared to other disks ?
    Assuming it only works when VM is once off but then What is the algorithm ? and how much time it takes to de-dupe. What happens when the original old files (referenced chunks) are updated ?
Shahid Roofi

  Problem with diff disks, is the architecture of it. With time, the derived disk grows equivalent to parent. even if a single minor patch is applied sometimes renders most of parent OS to be considered updated.
  others are achieving wonderful results with dedupe on VM library.
http://blog.compower.org/2013/10/31/deduplication-windows-8-1-laptop-great-hyper-v-lab-environment/. 80-95%. Highest space saving they claim on VMs.
  I would request VR28DETT to elaborate on the information on semantics of that dedupe process which we are unable to find yet. how it does the matching of similar contents and how often and what happens when the referenced data is updated so that
the child content is cross updated. What are the I/O penalties in achieving that. That is what we are interested to know instead of just the opinions.
  I am sure VR28DETT does have that information to help us out.
  @BrianEH: When we say Dedup is for static content, then also elaborate how static. It should be a read only data? btw is there a mentioning on TechNet docs that it's only for static content. please refer if it does.
The question you're asking is entirely rhetorical: you cannot use MSFT off-line deduplication with live data like running VMs (unless that's a VDI scenario and it's not what you do according to your first post). So for VM library you CAN use use both diff.
disks and dedupe (simplicity of new VM provisioning comes here as a benefit) or you can use dedupe only. For production you can use only diff. disks or dedupe enabled inside a Windows-running VM (hell to manage with shrinking VHDX and no deduplication between
VMs so very limited use and poor space savings). You can read more about dedupe and running VMs here:
Dedupe and running VMs
http://social.technet.microsoft.com/Forums/windowsserver/en-US/e275f38c-a440-4790-bd42-1024d0819000/dedupe-question?forum=winserverfiles#f6d2044c-8e3b-4ee5-a3c0-b663b97c729b
This decent discussion has all the links and answers for questions you've asked.
Hope this helped.
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

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