Slow Files Copy File Server DFS Namespace

I have two file servers running on VM both servers are on different physical servers.
Both connect with dfs namespace.
The problem part is both servers never have same copy speed.
Sometime very slow files copy about 1MBps on FS01 and fast copy 12MBps on FS02.
Sometime fast on FS01 and slow on FS02.
Sometime both of them slow..
So as usual I reboot the servers. Doesn't work.
Then I reboot the DC01 also doesn't work. There is another brother DC02.
After I reboot DC02, one of the FS become normal and another FS still slow.
FS01 and FS02 randomly. They never get faster speed together.
Users never complain slow FS because 1MBps is acceptable for them to open word excel etc.,.
The HUGE problem is I don't have backup when the slow FS days.
The problem since two weeks I'm giving up fixing it myself and need help from you expert guys.
Thanks!
DC01, DC02, FS01, FS02 (Win 2012 and All VMs)

Hi,
Since the slow copy is also occurred when you tried the direct copy from both shared folder, you could enable the disk write cache on the destination server to check the results.
HOW TO: Manually Enable/Disable Disk Write Caching
http://support.microsoft.com/kb/259716
Windows 2008 R2 - large file copy uses all available memory and then tranfer rate decreases dramatically (20x)
http://social.technet.microsoft.com/Forums/windowsserver/en-US/3f8a80fd-914b-4fe7-8c93-b06787b03662/windows-2008-r2-large-file-copy-uses-all-available-memory-and-then-tranfer-rate-decreases?forum=winservergen
You could also refer to the FAQ article to troubleshoot the slow copy issue:
[Forum FAQ] Troubleshooting Network File Copy Slowness
http://social.technet.microsoft.com/Forums/windowsserver/en-US/7bd9978c-69b4-42bf-90cd-fc7541ccb663/forum-faq-troubleshooting-network-file-copy-slowness?forum=winserverPN
Best Regards,
Mandy 
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are trying to better understand customer views on social support experience, so your participation in this
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    We currently have a file server that we need to setup Access Based Enumeration on to hide folders the user does not have access to. The server is 2008 R2 in a Windows 2003 Forest & Domain.
    I've read contradicting articles saying it will work on 2003 forest/domain level and another stating that it can work on a 2003 forest as long as the domain level is 2008.
    My other concern is that i am taking an existing file server and adding DFS to it. I have backups in place but will adding a DFS Namespace and eventually ABE affect my current shares or permissions?

    Hi, 
    Sorry for the delay.
    If you choose Stand-Alone Namespace and enable access-based enumeration in DFS namespace, Windows Server 2008 namespace server is required. If you choose a domain-based namespace, you must choose whether to use the Windows 2000 Server mode or the Windows
    Server 2008 mode. But only the Windows Server 2008 mode support for access-based enumeration.
    To use the Windows Server 2008 mode, the domain and namespace must meet the following minimum requirements:
    •The forest uses the Windows Server 2003 or higher forest functional level.
    •The domain uses the Windows Server 2008 or higher domain functional level.
    •All namespace servers are running Windows Server 2012 R2, Windows Server 2012, Windows Server 2008 R2, or Windows Server 2008.
    For more detailed information, please refer to the articles below:
    Enable Access-Based Enumeration on a Namespace
    http://technet.microsoft.com/en-us/library/dd759150.aspx
    Choose a Namespace Type
    http://technet.microsoft.com/en-us/library/cc770287.aspx
    For your second question, ABE only hides files and folders that users do not have permission to access, it doesn’t affect current shares or NTFS permissions.
    Regards, 
    Mandy
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