[THIN] Re: Citrix Server with 2 Nics
- From: "Dave Nelson" <David.Nelson@xxxxxxxxxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Sat, 06 Sep 2003 15:03:54 -0700
That's really strange... I have 4 6513 core switches and all of our
servers are Layer 2 redundant with one connection to one of the core
switches and the secondary connection to another of the core switches.
We also have a mish-mosh of various Compaq server types (580G1, 580G2,
380G1, 380G2, 380G3, etc), but they're all configured to use SmartSwitch
fault tolerance.
I will give you a word of advice here: we ran into issues when the
virtual MAC address used by the team is not the same as the Preferred
Primary NIC. We had very strange issues with network performance and
mysterious failovers on the NICs. Another piece of advise is to have
your network folks look at what rev of CatOS you're running on those
6513s. We just got done upgrading to 7.6.3 which fixed a bunch of
issues we were having with our 10/100/1000 copper blades, but introduced
new issues with EARL, HSRP, and port security. Depending on your
configuration, your mileage will vary.
David J. Nelson, CCEA, CCNP, CCDP, MCNE, MCSE, MCDBA, SCE
Network Specialist II
City of Henderson
240 Water Street
Henderson, Nevada 89015
Tel: 702.565.3851
Fax: 702.566.2296
Cell: 702.373-2932
E-Mail: djn@xxxxxxxxxxxxxxxxxx
Home Page: http://www.ci.henderson.nv.us
>>> rslayden@xxxxxxxxxxxxx 09/05/2003 5:31:33 PM >>>
A little more info on the benefits of Compaq dual NIC configurations
running Cisco Fast Etherchannel. About 2 weeks ago our network engineer
monitored bandwidth utilization of the network traffic across our 27 MF
1.8 servers and 4 clusters (Compaq PL 6400s/DL580s) and decided that the
teamed NICs would allow more effective fault tolerance if they were
re-configured to be fault-tolerant teams and the NICs split across two
Cisco 6513 switches. After making the changes, the performance in the
farm went to heck in a handbasket from the user perspective, including
servers dropping off the MF browse list, disconnected "black screen"
sessions, Citrix servers unavailable, and many profile and user home
subdirectory issues. The 4 SAN-attached clusters that support the farm
(profiles and user home subdirs) had been 4-port Fast Etherchannel
teams. Needless to say that after a week of trying to convince the
network guys that it was the NIC reconfiguration (it's not the network,
it's CITRIX!), we finally rolled everything back and lo and behold, no
more issues!
I don't know how many are running dual NICs configured for Cisco Fast
Etherchannel in their MetaFrame environments but it definitely provides
a significant performance benefit in our environment despite the
misleading bandwidth utilization metrics.
BTW, auto configuration is NEVER a good idea for media settings when
switch attached! I've seen lots of strange "network" problems occur when
we have neglected to hard code speed/duplex on server NIC ports.
HTH,
Rob Slayden
24 Hour Fitness, Inc.
-----Original Message-----
From: Claus, Brian [mailto:BClaus@xxxxxxxxxxxxx]
Sent: Friday, September 05, 2003 1:35 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Citrix Server with 2 Nics
Only problem is if the NIC teaming is set to 10\half and your switch is
set to 100\full...major performance problems...just do a ping
servername
-t I've seen 1 ping then multiple timeouts, then a few pings, then
more
timeouts, etc...
_____
Brian Claus, A+, Network+, MCP
Network Administrator
WESCO Distribution, Inc.
225 West Station Square Drive, Suite 700
Pittsburgh, PA 15219-1122
Phone: 412-454-2412
Fax: 412-454-2540
bclaus@xxxxxxxxxxxxx <mailto:bclaus@xxxxxxxxxxxxx>
_____
-----Original Message-----
From: Jason Benway [mailto:benwayj@xxxxxxxx]
Sent: Friday, September 05, 2003 3:19 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Citrix Server with 2 Nics
Any know problems having my Citrix XP servers have 2 nic on the same
subnet?
My new Dell Blade servers has dual nics for redundancy. Can/will this
cause
any problems?
Thanks,jb
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