[THIN] Re: Urgent Printing Issue - link flooding!
- From: "Joe Shonk" <joe.shonk@xxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Sat, 3 May 2008 08:55:54 -0700
Hello,
A couple of things:
Download and run the SMC Console. Thomas has copy on his website here:
http://www.thomaskoetzing.de/index.php?option=com_docman&task=cat_view&gid=5
8&Itemid=159
The SMC will let you drill down to the VC level to what your traffic
patterns look like.
Are you using compression/encryption anywhere between the two end-points?
Ie: Is the ICA session being encrypted and compressed? Are your routers
performing compression and encryption?
Consider setting bandwidth limitation via Citrix Policies
Aside for ICA traffic, what other types of traffic is going over the 1mbit
link.
Consider a differential compression and caching device (Like a WanScaler)
Not sure what you mean by Indirect UPD vs Direct UPD. There is only one
UPD. The Indirect vs Direct refers to use of Network Printers via UPD or
Directly.
Indirect -> The client network printer is created as an Auto-created printer
(using driver on server or UPD)
Direct -> If the client has a network printer mapped to it then the
Presentation Server will create map a network connection directly to that
Network Printer/Queue when the session is created and bypass the
auto-creation mechanism for that printer. This could also be your issue
Look into a third-party solution like screwdrivers or thinprint.
It's also entirely possible that user's needs have outgrown the resources
available to them.
Joe
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Angela Smith
Sent: Friday, May 02, 2008 1:52 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Urgent Printing Issue - link flooding!
Hi
I have a very serious issue I need assistance with with.
Site 1
Head Office, Citrix farm, AD Server, Windows 2003 File Server
Site 2
Small Citrix Office, 25 users, local Windows 2003 Print Server
We have a small office (Site 2) connecting to our Citrix farm (Site 1) over
a 1Mb link. The Small office has a local Windows 2003 Print Server. We
have an issue where the link is being flooded for the majority of the day.
Our Networks team have confirmed the traffic using all of the link is Citrix
(1494). I can only assume it is due to Printing but could be wrong..
The client workstations at Site 2 are Windows XP based. Users authenticate
over the WAN to AD (in Site 1). They are setup with Microsoft Network
Printers in Windows XP which get autocreated on the Citrix Server. I have
setup a Citrix Policy so only Universal Drivers are used (no Native Drivers)
and also using Indirect Printing. Applications used in Site 2 are mainly
Web based but most use JAVA. Users are complaining about Slow Printing and
Slow Application Access. Most likely due to link flooding and possible
packet loss on link.
1) Is there a better way to configure Printing?
2) I was under the impression Indirect Printing is the way to go as the
Citrix Server are not on the same LAN as the Print Server?
3) Is there an easy way to determine exactly what ICA traffic is flooding
the link? The Networks team don't have any tools that will provide any more
detail.
4) Is the link big enough? Is there a rule I can follow - ie 50kb per user?
5) I have not enabled Print bandwidth restrictions. Is this recommended to
limit the bandwidth a print job can use? What is the recommended setting
for a 1Mb link? Some users print large reports - ie 300 pages which already
takes around 5 minutes before the Printer will start. Restricting the Print
job would make it even slower would it not?
6) What is the Print flow in my scenario. Troubleshooting may be easier if
I know the Printing process flow
Example - User Prints from Word in Citrix using Universal Driver
Citrix Server to Client (Print Job Compressed and sent as EMF image to
client)
Client to Citrix Server (Compressed)
Citrix Server to Print Server (Compressed)
Print Server - Printer (Spools)
The above may be completely wrong. Please help me understand how Print flow
works in Citrix when Indirect Universal Driver Printing is used vs Universal
Driver Direct Printing.
7) Id like to know how big the Print traffic is when travelling from Citrix
Farm to client and whether there is a way to fix/control it. Is there an
easy way to measure this?
This is causing me alot of stress and any help would be really appreciative.
Regards
Angela
PS - I just worked all night looking at this issue so apologise if my
description isn't clear...
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