See below
_____
From:
[email protected] [mailto:
[email protected]] On
Behalf Of brother_of_karamazov
Sent: Wednesday, July 11, 2007 8:57 AM
To:
[email protected]
Subject: Re: Number of web servers
Quote:
_____
We are in the process of upgrading to 8.12 with TR 8.96.1
Just wondering how many web/jas servers others are using?
We have two production servers (2 CPU/machine) clustered horizontally and
vertically for a total of 4 JVM's We also have 1 box for non-production
environments and 1 instance for JPD812 DataBrowser. This way, if
DataBrowser crashes the system it is on a non-production box.
What rule of thumb do you use for # of users peer server ?
Oracle still recommends 1 JVM per CPU with up to 150 users per instance/JVM
Do you share the load by using DNS round robin ? Any problems ?
I configured the Network Deployment (deployment manager) that has round
robin. We have not had any problems so far, but our concurrent user
population in only around 150 total users.
Thanks in anticipation
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I configure the web side with:
1- Production Isolation - A webserver for non-production and webserver(s)
for production
2- DNS round-robin for budget conscious customers, hardware load-balancing
for those with deep pockets.
3- Multiple production servers with combined HTTP/WAS using both vertical
and horizontal WAS cloning to ensure failover and performance
load-balancing.
4- Name-based virtual hosting (
http://www.thestevensons.org/node/view/647)5-
Network Deployment on E1 Deployment Server
Some others may be able to give you # of users per server but the old rule
of thumb is 250 users per jvm and one jvm per CPU (real CPU, multicore CPU
but not hyperthreaded). Thus, if you have 4 dual-core CPU's you would create
8 jvms using vertical cloning and have (theoretically) capacity for 2,000
users, assuming an appropriate amount of RAM. If you have a second
production webserver (which you should) with the same 4 dual-core CPU's you
would horizontally clone the original jvm another 8 times and have
(theoretically) capacity for 2,000 more users. I'm sure one of the other
guys will mention that these are probably unrealistic numbers but it
demonstrates the power of cloning.
Oh yeah, you'll hear many theories on jvm heap size. The current, popular
number is 1024M min/max. I like many 768M min/max jvm's.
Brother Of Karamazov/Jeff Stevenson! <http://www.thestevensons.org>
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