Slow UNC or mapped copying even using only local resources?

Discussion in 'Windows Small Business Server' started by Brenda, Sep 6, 2008.

  1. Brenda

    Brenda Guest

    We have some kind of I/O issue on our SBS 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
    problem.

    Can anyone help?

    Thanks.
     
    Brenda, Sep 6, 2008
    #1
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  2. How many nics in your server?
    Please post the results of running an IPCONFIG /all from both the server and
    a workstation
     
    Cris Hanna [SBS - MVP], Sep 6, 2008
    #2
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  3. Brenda

    Brenda Guest

    I don't understand. The experiment doesn't involve any workstation or
    any network traffic does it?
     
    Brenda, Sep 6, 2008
    #3
  4. In addition to what Cris requested, which we would like to have for
    reference, please download and run the SBS BPA, and fix anything it finds.

    www.sbsbpa.com

    --
    Larry

    Please post the resolution to
    your issue so that all can benefit.
     
    Larry Struckmeyer [SBS-MVP], Sep 6, 2008
    #4
  5. such requests (copy \\localhost\a*.* \\localhost\b), even though they are
    for local resources, go through the IP stack. An improperly configured NIC
    would cause problems.

    But yes, if this was \\server\ba\*.* - \\server\b performed from \\server
    the workstation config wouldn't matter. However IMHO Cris is right to ask
    for such info because he is more concerned about the overall network config
    than this (possibly considered rather silly) test.
     
    SuperGumby [SBS MVP], Sep 6, 2008
    #5
  6. Thanks Larry and SG for being awake much earlier than I. Larry makes the
    excellent recommendation as well that I frequently forget to add regarding
    running the SBS BPA and fixing anything it finds. you can find it at
    www.sbsbpa.com
     
    Cris Hanna [SBS - MVP], Sep 6, 2008
    #6
  7. Brenda

    Brenda Guest

    I ran the BPA and fixed the two issues it found:

    1. NIC driver more than one year old -- I updated it to the most recent
    version

    2. Task offloading is enabled -- I modified the registry as per Q904946

    I then rebooted the server and ran the BPA again with no issues found.
    However, the slowness remains.

    Here's an IPCONFIG/ALL from the server. No access to a workstation
    this weekend but no workstation is involved with this anyway. The
    Yukon adapter is the inside network:

    Microsoft Windows [Version 5.2.3790]
    (C) Copyright 1985-2003 Microsoft Corp.

    C:\Documents and Settings\Administrator>ipconfig/all

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : xx
    Primary Dns Suffix . . . . . . . : xx.local
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : Yes
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : xx.local

    Ethernet adapter Network Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Realtek RTL8139 Family PCI Fast
    Ethernet NIC
    Physical Address. . . . . . . . . : 00-14-6C-72-C2-E2
    DHCP Enabled. . . . . . . . . . . : No
    IP Address. . . . . . . . . . . . : 10.0.1.22
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 10.0.1.1
    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Disabled

    Ethernet adapter Server Local Area Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Marvell Yukon 88E8001/8003/8010 PCI
    Gigabit Ethernet Controller
    Physical Address. . . . . . . . . : 00-11-2F-A5-1D-A8
    DHCP Enabled. . . . . . . . . . . : No
    IP Address. . . . . . . . . . . . : 192.168.0.1
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . :
    DNS Servers . . . . . . . . . . . : 192.168.0.1
    Primary WINS Server . . . . . . . : 192.168.0.1

    C:\Documents and Settings\Administrator>


    Thanks.
     
    Brenda, Sep 7, 2008
    #7
  8. Hi Brenda:

    Further, both of these subnets are asking for problems if you do VPN's to
    this server from outside the LAN. Many/Most home user quality routers use 0
    or 1 for the third octet of the ip address, and VPN's will not work if both
    ends are on the same subnet.

    I suggest that you change the "internal" nic to 192.168.16.x, using the SBS
    Wizard, and the "external" nic and the LAN side of the router/firewall to
    192.168.61.x or some other series that will not be in the same range as
    home routers/systems.

    Lastly, and important for your network and peace of mind, every nic in your
    lan should point to the ip of the internal nic for DNS, and the SBS should
    be the DNS and DHCP server for the network. If it is enabled, turn off the
    DHCP server on the router, and enable it on the SBS.

    If you change the ip of the internal nic, you must use the SBS wizard, and
    in any case you should run the CEICW to put all the right addresses in all
    the right places.

    -Larry


     
    Larry Struckmeyer [SBS-MVP], Sep 8, 2008
    #8
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