Kevin,
I will answer questions 2-3
2- The primary benefit of moving to Enterprise is the ability to run
Multi-Instance Server configuration (JRun/CFMX). This will allow you to
have more than one application server on the same machine. You can then
cluster those servers and replicate sessions.
If you do the above then you gain two things:
a. If one of the servers in your cluster goes down/hangs/becomes
unresponsive then the cluster manager would move all
the users on that server that went down to the next server in
the cluster. This is done seamlessly since the sessions
are replicated.
b. You can allocate the same JVM max heap size to each server in
the cluster (if your hardware can accommodate that).
This would mean that if your single instance server is allocated
1.5 GB of memory as the max heap. If you run
Multi-Instance Server install then you can allocate a Max Heap
size of 1.5 GB to each server. In that case if that
box is running two servers in a cluster then each of these
servers would have 1.5 GB of memory available to the JVM
while handling only half the traffic that would normally go to a
single instance server install (this is still
assuming that you have enough memory sticks to accommodate your
JVM memory needs).
3- How complicated ..? This depends on your needs. If you would do
sticky sessions, replicate sessions and round robin for example then you
will keep each user on the server instance he hits until session is
terminated (or server goes down and the user gets shifted to another
server). I think one of the concerns when using clusters is objects in
the session scope since session replication does not replicate objects.
Also if you will replicate sessions, you would need to enable the use of
J2EE session variables under your memory variables in the CF Admin.
You would be able to take advantage of the System Probes which is a
utility that is available in Enterprise (as well as Developer's edition)
which allows you to monitor your servers. This would come very handy
when your server in the cluster goes down and no one recognizes that
since users would be moved to another server within the cluster. If you
have your System Probes running against each server instance in your
cluster you would be alerted to the failure and can go in and fix the
problem before it is noticed. I hope this helps.
Ahmed El-Rasheedy, MBA
Senior Programmer
Information Services
Office: 972-807-1206
Unitrin Specialty - Insurance for U
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kevin Fricke
Sent: Monday, March 06, 2006 8:04 PM
To: CFLIST
Subject: [DFW CFUG] Server questions
Please help!
My company is looking at making the move to enterprise as we have vastly
outgrown our current hardware. We are having constant reboots of the
server and the database. That said, I have a few questions:
1) how much will the performance of our applications be helped by
moving to MSSQL from mySQL (if any). For obvious reasons ($$$) we would
like to stay with mySQL. We have not made the switch to 5.0 yet but
will be when these upgrades have been completed.
2) in a nutshell, what are the primary benefits for moving from cfPro
to cfEnterprise?
3) how complicated is maintaining application and session variables in
a cluster?
4) any other advise before we move from a single application server to
a cluster?
Thanks!
Kevin
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