protecting large file shares > 4tb


  • Is anyone protecting large file share servers that are greater than 4tb? How are you doing it?  Are you re configuring the server on prem to only use 4tb or smaller drives that are striped to a larger volume then replicating it with ASR? Any issues with the disk striping?  Or are you using a different method? I am looking to protect an application but part of it has a 20tb volume that I need to figure out what to do with it.


    Monday, February 26, 2018 5:58 PM

All replies

  • As per the azure platform limit ASR can only protect if the disk size is less than 4 TB. You can see the link for more details on azure limits.

    If you wish you may leave your feedback here. All the feedback you share in these forums will be monitored and reviewed by the Microsoft engineering teams responsible for building Azure.

    As a work around you can add a few 4 TB disks and configure a storage spaces/striping on the machine.  


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    Monday, February 26, 2018 6:42 PM
  • Hi Dane_B,

    We have a number of file servers larger than 4TB that are protected using ASR. We use exactly the process that you mention with various numbers of local disks stripped to make the larger volume. 

    The following link steps you through the process, prior to the maximum disk size being 4TB but the principle is essentially the same.

    Hyper-V Replica ensures write order consistency when replicating multiple VHDs of a single Hyper-V VM. If write1 is made to Disk1, write2 is made to Disk2 and write3 is made to Disk1 in that order, Hyper-V Replica will ensure that the same order (write1, write2, write3) is maintained. This consistency will ensure that the striped disk is recoverable post failover to Azure.

    Although you don't need it, you could also look into configuring EnableWriteOrderPreservationAcrossDisks to 1 which I've used in the past when using ASR or Hyper-V replica to keep standalone SQL servers with multiple disks consistent. 

    Hope that's of some assistance. 

    Kind Regards

    Michael Coutanche



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    Monday, February 26, 2018 9:54 PM