I just don't understand what could possibly be causing this issue.
I have two users, one for myself and another for the on-site administrator of a server. This server's purpose is to hold a large amount of data for a project and to provide remote desktops to a small handful of workers on that project. Due to the nature of NTFS after you cross a million or two files and folders and the inability to run chkdsk on that much data, we have implemented a procedure in which there is a single ReFS volume, in which several VHDs are hosted. So users will access drive E: (Project Data 1) but in fact it is a mounted VHD on drive D: (Data). I don't think that's the cause of my issue, but I mention it to be complete.
Throughout the course of working on this project, our users upload chunks of data, from 300000 files to a bit over 1000000 files at a time, into a folder or folders in drive E:. They typically do this via the network as this subfolder is shared. Often each chunk of data will go into a new folder under the project subfolder that the user creates. They also sometimes use external drives, they plug in the drive with the data to the server and then remote into it and initiate the copy.
Lately, although they have NTFS permissions to E:, share permissions to the folder, etc. They are getting intermittent access denied. Even in folders they themselves created. Sometimes they create the folder and copy over files without issue one day, then the next they are unable to copy new files. Other times the access is denied right in the middle of a transfer.
One of the users this is effecting is a domain administrator who has the exact same permissions that I do. I am able to access the folders, she isn't. I've looked over permissions on the drive, folder, subfolders, etc, and everything looks like it should be open to these users.
To copy these files we use Roadkil's Unstoppable File Copier. I originally suspected that it was keeping permissions/attributes, but we have since tried unchecking the box to keep attributes and no difference. Once the access is denied to these users, they are unable to copy and paste with the default dialogue either.
Thanks in advance,
Brandon