Re: SLow drive access on fileserver
From: Todd J Heron (todd_heron_no_spam_at_hotmail.com)
Date: 02/23/05
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Date: Tue, 22 Feb 2005 23:48:04 -0500
1) Temporarily disable any real-time anti-virus software to see if that
helps, and if it does, re-configure your AV settings to something more
appropriate for your environment. Also, in cases of a direct cross-over
cable between a client and a server, buy a switch and use regular CAT 6
cable.
2) Verify that you are running the latest and the correct network adapter
driver. Obtain and install the latest manufacturer driver for the card
instead of using one that Microsoft has provided. (also see if the
manufacturer has any utilities you can use to check NIC performance).
3) Verify the network cards of all clients and servers, switches, hubs and
routers are set to the same speed and duplex settings (i.e. 100mb/sec & Full
duplex). If the hubs or switches have utilities you could use to see if it
may be logging errors that will help your troubleshoot if it is a patch
cable somewhere on the network
4) The problem may be SMB signing or LAN Manager authentication level. In
Windows 2003, default server policy forces all SMB traffic to be digitally
signed which seems to cause a problem in some configurations of XP Pro. In
Local Security Policy (Start > Run > secpol.msc > OK) navigate to security
options (Security settings > Local policies > Security) and try disabling
the option for Microsoft network server:digitally sign
communications(always). Ensure you do this on all machines involved (such
as via a GPO for an OU). Run gpupdate /force on the server after making the
change and do the same on the client machine afterwards.
Security settings that can cause a problem with downlevel client access:
http://support.microsoft.com/default.aspx?scid=kb;%5BLN%5D;811497
http://support.microsoft.com/default.aspx?scid=kb;en-us;823659
See also:
Slow SMB performance when you copy files from Windows XP to a Windows 2000
domain controller:
http://support.microsoft.com/?id=321169
5) Another possibility involving slowness between XP and Windows Server
2003 computers:
New registry entry for controlling the TCP Acknowledgment (ACK) behavior in
Windows XP and in Windows Server 2003:
http://support.microsoft.com/default.aspx?kbid=328890
-- Todd J Heron, MCSE Windows Server 2003/2000/NT ---------------------------------------------------------------------------- This posting is provided "as is" with no warranties and confers no rights
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