Slow UNC or mapped copying even using only local resources?

Discussion in 'Windows Server' started by Brenda, Sep 5, 2008.

  1. Brenda

    Brenda Guest

    We have some kind of I/O issue on our Server 2003 machine.
    At first I thought it might be a network problem but, based
    on my experiment below which involves no network traffic
    at all, I think it's something else.

    Here's the experiment:

    1. Create two folders on the desktop called 'A' and 'B'

    2. Turn on sharing on folder 'B'

    3. Place a 200 MB test file in folder 'A'

    4. Copy file from 'A' to 'B' -- takes just a few seconds.

    5. Click Start/Run and run \\server\b

    6. Copy file from 'A' to \\server\b -- takes ten minutes!

    7. Map drive Z to \\server\b

    8. Copy file from 'A' to Z: -- also takes ten minutes!

    Why the slowness with mapped drive or UNC even on the same
    local machine not traversing the network? Is the NIC still
    involved somehow even with only local resources involved?

    So far, I've found the references to SMB and TCP ACK issues
    and even tried the suggestions with no effect on this performance

    Can anyone help?

    Brenda, Sep 5, 2008
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