Re: Very Strange Network Problem HELP!!!
From: serverguy (nospam_at_hatespam.com)
Date: 07/16/04
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Date: Fri, 16 Jul 2004 13:24:43 -0400
I agree with Dave, and I would add:
- why hubs?? Any possibility you could use just switches?
- checked the speed/duplex settings of the ports and nics? What else can
you describe about the nics in the servers and cabling? teamed? fiber?
- have you definitely ruled out software issues? Are your citrix profiles
local or roaming? I would eliminate any roaming profiles b/c they can be
slow, you can do this with policies.
- any other policies that might be loading to the clients? Maybe try
disabling policies temporarily and build a fresh client. Any event log
errors on the citrix servers or DCs?
- when you said that you tested the servers separate from the network, how?
did you have a domain controller also or just citrix server(s)? I am making
many assumptions here - that you have cloned the citrix servers from
identical builds? that you tried removing servers indivually from the farm?
that no other network problems exist (w/SQL or domain replication, for
example), and that it is definitely isolated to citrix only.
- what version of citrix? have you called them yet?
"Craig N." <cnash@xxplego.com> wrote in message
news:9PJJc.262236$Gx4.157823@bgtnsc04-news.ops.worldnet.att.net...
> I have a very strange problem here, been working on it for 4 months now,
> hopefully someone can give me some advice.
>
> Anyways, I have a client with 200 users running Citrix. The network
> configuration is:
>
> all main servers are HP DL380's, Dual xeon 3.0's, 1 gig of ram
> 2 domain controllers - win'2000
> 4 Citrix servers
> 1 SQL server
> 1 Print Server
> 1 EMC Clarian SAN
> 1 Lotus
> 1 HP-UX running BPCS
> Switches:
> 4 Intel Express Hubs 12 Port
> 2 3COM hubs
> 2 HP 2524 Switches
> 2 Cisco Catalyst 2900 Switches
> 1 Cisco Catalyst 3500 Switch
> 4 Old SMC Hubs for the phone system
>
> Anyways, the client was running old servers, so they upgraded to HP DL380
> servers, and Citrix ran great, then a few days later it went to crap. The
> logins were slow, trying to open office documents through office was slow
> (but opening through explorer was not), and when typing, it would lag real
> bad. (This is Citrix Specific)
>
> I came in to try to fix it, and we tried everything until we finally
rebuilt
> the domain controllers and Citrix farm, since the problem really seemed
like
> a server issue. Well, after rebuilding from scratch, we stil had the same
> problem, so we tested everything, and it looked good. I then got an idea,
it
> felt like it might be network traffic.
>
> I took a catalyst 2900 switch that had never been connected to the
network,
> and ran the servers to it, and 6 thin clients. We turned it on, and the
> thing cruised. It rocked, logins were instant, it was the first time it
> worked in 4 months. So, I figured I would track down the problem, I
started
> plugging in switches one at a time until the problem surfaced. I got all
the
> Intel hubs connected, nothing, then I connected the 3coms, still nothing,
> and then the HP switches, so far so good.
>
> By now, its 1:00 AM, and I decide to go home, I quickly connect in the
rest
> of the switches at once, and BOOM, the problem shows up, so I figure I
have
> it down to only a few switches, lets go home and try tomorrow. I move the
> network cables over to the old servers, then I Connect this switch into
the
> network, and leave. (It was easier, than moving cables everywhere, since
the
> switch room is seperate from the server room, and I was tired)
>
> Next Day, I'm excited, so I decide to show it off. WELL, I move my network
> cables to the old servers, and unplug the switch from the rest of the
> network. The problem is back!!! I reboot the switch, I reboot the servers,
> nothing. I even swap network cables. This is the exact same configuration
as
> last night when it was running great. I dont get it. I guess maybe
something
> from one cisco switch has infected this one, who knows.
>
> I do know that the HP switches didnt cause a problem, so I empty them out,
> and plug in only my servers and thin clients, nothing else, completely
> seperate from the network. STILL THE SAME PROBLEM!!
>
> This is weird, and I need to fix it. Its like whenever you add a switch,
it
> acquires this problem, but a brand new switch runs great until it is
> connected to the network for any length of time. It ran great on the other
> switch for a good 5 hours, so I know its not the servers, gotta be the
> switch. Does anyone have any ideas?
>
> I am resetting my catslyst to factory default then going to try it.
Someone
> please help, I need this up by monday.
>
>
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