???I was hoping for encouragement...
I can run 20 absolutely concurrent users at my app, which is very
db-intensive, indefinitely without it falling over, & get a throughput of
about 100000 pages/24 hours. Should speed it up. That's a Dell dimension
733 128Mb ram with postgres on the same box. So you should be able to
support the load you describe on any one of those boxes without separating
out the db and the app. Are you planning on using mod_jk & load balancing
on the 3rd box to get the redundancy? You could possibly do with getting a
lesser box for the apache server and more ram or dual processors for the
java/db boxes - apache is pretty lean and java isn't. [good job nobody reads
this list]. I've got no idea how you'd do a failsafe db, short of the wild
ideas below.
Also, how much writing to disk will go on? What about RAID?
Alistair
-----Original Message-----
From: Cato, Christopher [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 10, 2001 3:57 PM
To: '[EMAIL PROTECTED]'
Subject: RE: ?? Hardware Recommendations + Database replication, any
ideas ??
When I say 100 concurrent users I'm talking about human users, not loadtest
users.
Currently, I'm thinking three Dell PowerEdge 2450 rack mountable servers
with 512 mb ram each and 733 or 933 cpu.
Seem okay to you?
/christopher
> Also, when you say 100 concurrent users, do you mean
> concurrent human (they
> read the web page) or concurrent loadtester (ask for another
> as soon as they
> get the first). There's maybe an order of magnitude
> difference: anybody
> have any figures on the difference?
>
> Alistair
>
>
>
> -----Original Message-----
> From: Cato, Christopher [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, January 10, 2001 3:04 PM
> To: '[EMAIL PROTECTED]'
> Subject: ?? Hardware Recommendations + Database replication, any ideas
> ??
>
>
> Hello.
>
> I'd appreciate some advice from the pro's on what hardware to
> buy for a
> certain web application. The system in question is a commerce
> system based
> on JDK 1.3, TomCat, Apache and MySQL, run on Red Hat Linux
> 6.2 (we need to
> stick to that OS and version.) and is built as servlets.
>
> The system is targeted towards max 1000 users, probably max
> 100 concurrent
> users.
> The requirements are that it should be failsafe (i.e. replica server2
> replaces server1 on crash)
> and it should be fully recoverable in event of total crash.
>
> So, my questions are really:
> - What kind of hardware is required to meet the demands of
> the user load?
> (1000 users, 100 max concurrent)
>
> - How does one set up the replication between the servers?
> - How to determine (and switch) the servers in the event of a crash?
> - Any ideas on how to do the backup system required for this?
>
> I'd be thankful for some advice on this....
>
>
> /Christopher Cato
>
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