Azure Storage - File Share - 16m files in nested subfolders moved instantly without our invovement

Damian 1 Reputation point
2022-04-05T09:53:10.117+00:00

I have a Azure storage account, a file share. This file share is connected to a Azure VM through mapped drive. A FTP server on the VM accepts a stream of files and stores them in the File Share directly. There are no other connections. Only I have Azure admin access, limited support people have access to the VM.

Last week, for unknown reasons 16 million files, which are nested in many sub-folders (origin, date) moved instantly into a unrelated subfolder, 3 levels deep.

I'm baffled how this can happen. There is a clear instant cut off when files moved.

As a result, I'm seeing increased costs on LRS. I'm assuming because internally Azure storage is replicating the change at my expense.

I have attempted to copy the files back using a VM and AZCOPY. This process crashed midway through leaving me with a half a completed copy operation. This failed attempt took days, which makes me confident I wasn't the support guys dragging and moving a folder by accident.

Questions:

  1. Is it possible to just instantly move so many files (how)
  2. Is there a solid way I can move the files back, taking into account the half copied files - I mean an Azure backend operation way rather than writing an app / power shell / AZCOPY?
  3. So there a cost efficient way of doing this (I'm on Transaction Optimised tier)
  4. Do I have a case here to get Microsoft to do something, we didn't move them... I assume something internally messed up.
Azure Files
Azure Files
An Azure service that offers file shares in the cloud.
1,171 questions
Azure Storage Accounts
Azure Storage Accounts
Globally unique resources that provide access to data management services and serve as the parent namespace for the services.
2,729 questions

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  1. Sumarigo-MSFT 43,816 Reputation points Microsoft Employee
    2022-04-13T11:04:45.893+00:00

    @Damian Firstly, apologies for the delay in responding here!

    Based on your scenario we need to investigate the root cause, I recommend opening a support case. (To sort this out – Your best bet is to connect with our Azure support team by filing a ticket, our support team on best effort basis can help you guide on this matter. ) or please do let us know if you don't have the support plan.

    Please let us know if you have any further queries. I’m happy to assist you further.

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