Citrix 1.x - ICA session latency

Posted by citrix on November 10, 2008
Zack Pittman I have a domain with 9 XPe servers with 40 users on each server running full desktops. The servers are all running Sata Raid 5 drives. All have 4gb of RAM. All are dual Xeon processors ranging from 2.8 ghz to 3.4ghz. I don’t think the servers are the problem but i do think it could have something to do with the networking side. Example: I checked some users ica channel data with the session monitoring tool and found some users with much higher latencies than others on the same server but when i check the problem child sessions local site for latency I don’t see anything with tracerts. Is there a tool of some sort that could help me find out where the latency is coming from? Maybe it’s the network cards buffer isn’t able to handle the load? Any help would be appreciated!
Peter David I’d also take a look at the disk subsystem. The architecture of SATA drives means that they don’t ‘multi-task’ as well as SCSI. Use performance monitor to check for disk queue length and average seek times.

Even SCSI disk subsystems, configured without battery backed write cache, can cause session disconnect issues when the disk subsystem gets real busy.

Some benchmark data I have seen suggests that IDE and SATA based systems start to degrade seriously after 30-40 user connections.

What kind of latency are you seeing? A netmon trace will show you the delta times between packets, this should give an idea whether the latency is client, server or network related.
Category: Citrix 1.x

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