Large file copy performance issue with Windows 2003
COERCITAS
While copying large files (about 50 Go), we encounter huge performance drop
(from 40% of our gigabit connection to 0,05%, figure...) very quickly. In
fact, system memory seems to fill up and then, performance is down.
We already tried to change parameters in the network car properties
(especially file sharing properties) but nothing works.
Our destination server is a Dell Powervault 745N with CERC SATA raid
controller and Intel PRO/1000 network adapters, source box is a BladeCenter
HS40 blade. Switch is a 3Com 3848.
We didn't teamed up network adapters yet.
Can someone help with this issue ?
Regards.
Todd J Heron
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 that you can resolve the server name from the client and that the
client can resolve the server. Check DNS and make sure your server has only
the correct IP address.
4) 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. If hard-coding the same speed doesn't help,
then set all devices back to auto-negotiate.
5) 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
http://support.microsoft.com?kbid=822219 "You Experience Slow File Server
Performance and Delays Occur When You Work With Files That Are Located on a
File Server "
6) 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; CCA
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This posting is provided "as is" with no warranties and confers no rights
COERCITAS
I'll try to answer as best as I can your points :
1) Everything is up to date I think. I fail to find any component not
running the last drivers.
2) Same answer, of course. I'll check out if there are any really usefull
utility with those NICs, I think there are.
3) Everything is OK with DNS and TCP/IP configuration.
4) Everything is set to 1000 (full, of course). There is no error while
connecting nor working, only performance drop box side.
5) disabling this would prevent me from connecting to the said server with
TS for example, which may cause many problems the way we are using it...I
tried nonetheless but except the unability to connect with TS, nothing
worked better. I didn't read all the documents you linked, will do by the
way.
6) Tried this already, didn't change anything.
I may add it seems the problem is memory related since it occurs when server
run out of memory, which happens very quickly when we try to copy large
files. I guess the system caches data in memory before writing it to disk
but data come much more quickly than system can write to drives. Behaviour
may be caused by hard drive failure or RAID failure. I will check all of
this and keep you updated.
By the way, do someone know how to configure memory cache behaviour with
disks in registry ?
Regards
"Todd J Heron" <todd_hero...@hotmail.com> a écrit dans le message de
news: #rWo6PSf...@TK2MSFTNGP12.phx.gbl...
Manny Borges
There are 4 items that are going to infulence performance.
CPU
RAM
Disk subsystem
Network interface.
I would thing that the Disk subsystem is caching to RAM
and hitting a roadblock there.
I would contact Dell or CERC and see if they can shed any light on the
controller, how much cache it has and whether it is write through or write
back caching.