I've got 24 Sunray 2FS DTUs hanging off a single SRSS server (whitebox,
2x Xeon 2.6GHz CPU, 6GB RAM, Solaris 10). By default, they connect to a
Windows Terminal Server (SunFire X4600, 4x Opteron 8218 2.6GHz CPU, 16GB
RAM, Windows Server 2003) via srwc. The DTUs are on a completely
separate subnet from the rest of my network. The SRSS host has a single
interface that is on this subnet that is used for all DTU communication.
The SRSS host also has a direct cable link (crossover cable) to the
WTS host. Both the SRSS host interfaces and the WTS interface are all
1Gbps.
This setup is used in a classroom lab setting. During class, there can
be anywhere from 10-20 students using the lab at the same time. We are
a computer science program, so students use development platform
applications, such as Eclipse, Visual Studio, and Rational System
Architect (formerly Rational Rose), among others. In my second year of
running this system, we seem to be having significant performance
problems with a large number of users trying to load applications
simultaneously. eg, if a class comes in and they all login and try to
load eclipse, the system will grind to a halt and become completely
unresponsive until the app is loaded for everybody. This can take up to
30 min before the DTUs are usable.
I've been monitoring resource usage on the WTS host using Sysinternals
Process Explorer
(http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx). As far
as I can tell when the system gets bogged down like this, I am not
seeing any CPU. memory, or I/O wait causing the latency. The CPU
utilization jumps around between 20-60%, and I only see usage spikes on
2 of the 8 CPU cores. RAM utilization stays absolutely stable, right
around 4GB of my 16 available. File I/O is barely noticeable.
So the next thing I'd like to look at is the resource consumption of the
SRSS host. Can anybody point me at some good tools for this? I'd also
like to monitor the network usage and see if there's a bottleneck there.
Again, if there are any tools for this, or specific SRSS-related
tools, please let me know.
If anybody has any good load-balancing tips for my situation, I'd love
to hear them. I'm running SRSS 4.1 and srwc 2.1, I have not yet updated
to the latest release. I love my SunRays, but if this continues to be a
problem, I'll have to scrap them and go back to maintaining 24 PCs
again. I want to avoid this at all cost.
Thanks.
Seth
--
Seth Galitzer
Systems Coordinator
Computing and Information Sciences
Kansas State University
http://www.cis.ksu.edu/~sgsax
[email protected]
785-532-7790
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