Thanks Simon
Yeah, I had implemented the value to be brought down to 30 seconds which
helped immediately. The problem we have now encountered is no longer
with TIME_WAIT and now with CLOSE_WAIT.
You don't perhaps know the default a windows 2k box is for max tcp
connections. A little birdie has told me it is ten which at first
thought seem to be very low. My thinking is increase the max number of
open tcp sockets and alleviate the issue ???
Regards
Dave
-----Original Message-----
From: WEAVER, Simon [mailto:simon.weaver at astrium.eads.net]
Sent: 31 October 2006 06:31
To: Clooney, David; veritas-bu at mailman.eng.auburn.edu
Subject: RE: [Veritas-bu] CLOSE_WAIT
David
I have a Support Call open, in regards to Media errors, and the Symantec
Engineer said the following.....
Simon,
Tcp tuning parameters changes the wait time for a port which is in a
TIME_WAIT state. A port will stay in this state for 4 minutes by
default.
Decreasing this time allows the port to be closed sooner rather than
later allowing the port to be re-opened or stay as listening if need be.
I noticed VMD (the volume manager daemon process) in TIME_WAIT state. If
NetBackup VMD is timing out when trying to write to the next media or
when trying to write header information, this could possibly cause
problems.
NOTE: For more information see Microsoft article # Q120642 at the
following
URL:
TCP/IP and NBT Configuration Parameters for Windows 2000 or Windows NT
http://support.microsoft.com/default.aspx?scid=kb;en-us;120642
I think this is the same link Steve sent, but does any of this help
answer your Q - For the record, I have NOT implemented this yet, as I
have made one major change and want to review this before applying any
other fix straight away (otherwise applying multiple fixes at the same
time, means I have no trackable method of knowing what fixed the root
problem).
Regards
Simon Weaver
3rd Line Technical Support
Windows Domain Administrator
EADS Astrium Limited, B23AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU
Email: Simon.Weaver at Astrium-eads.net
-----Original Message-----
From: Clooney, David [mailto:david.clooney at bankofamerica.com]
Sent: 30 October 2006 10:44
To: veritas-bu at mailman.eng.auburn.edu
Subject: [Veritas-bu] CLOSE_WAIT
Hi All
Scenario :
Master server Solaris 8
Media server windows 2000
Over the past weekend we encountered a whole bunch of 219's on jobs
using a
particular media server, a netstat on the media server provided the
below
snapshot. The CLOSE_WAIT entries seemed to hang around for ages,
additionally hogging sockets. On the master server everything was
plodding
along as usual.
Q1. can anyone explain why these sockets on the media server do not
close
fully and hang around for quite sometime ? If indeed the master server
has
not
finalised comms, what (on the master) would be keeping the socket
open
between the two.
Q2. Does anyone know the default setting for the maximum number of
simultaneous tcp connections on windows 2000?
Q3. If I was to add the registry key to tcp parameters
"TcpNumConnections" ,
what guidelines could I follow to determine the number of connections ?
Q4. Not so long ago on the same windows media server I added the
registry
key to tcp parameters "TcpTimedWaitDelay" in order to clear TIME_WAIT
more
quickly. Are there any known issues with windows 2000 and tcp
connections that I'm not aware off ?
Much appreciated
David Clooney
TCP media_server:bpcd media_server:795 ESTABLISHED
TCP media_server:bpcd media_server:834 ESTABLISHED
TCP media_server:bpcd media_server:868 CLOSE_WAIT
TCP media_server:bpcd media_server:991 CLOSE_WAIT
TCP media_server:bpcd master_server:551 CLOSE_WAIT
TCP media_server:bpcd master_server:562 CLOSE_WAIT
TCP media_server:bpcd master_server:591 CLOSE_WAIT
TCP media_server:bpcd master_server:610 CLOSE_WAIT
TCP media_server:bpcd master_server:645 CLOSE_WAIT
TCP media_server:bpcd master_server:696 CLOSE_WAIT
TCP media_server:bpcd master_server:768 CLOSE_WAIT
TCP media_server:bpcd master_server:807 CLOSE_WAIT
TCP media_server:bpcd master_server:829 CLOSE_WAIT
TCP media_server:bpcd master_server:830 CLOSE_WAIT
TCP media_server:bpcd master_server:867 CLOSE_WAIT
TCP media_server:bpcd master_server:904 CLOSE_WAIT
TCP media_server:bpcd master_server:919 ESTABLISHED
TCP media_server:bpcd master_server:976 ESTABLISHED
TCP media_server:bpcd master_server:982 CLOSE_WAIT
TCP media_server:bpcd master_server:1008 ESTABLISHED
TCP media_server:bpcd master_server:1023 ESTABLISHED
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