RE: Switching to Java on OS/400 - got a few questions.

> > From: StokesP@xxxxxxxxxxxxxxxx
> >
> > Generally I'd agree. I've only seen 1 instance where there was a big
> > difference - even with recommended upgrades (v. expensive ones!! to an
> > already top of the range AS400), the AS400 still couldn't touch an 5k
> > (euro) dual xeon running Tomcat / WS.
>
> Why would you expect a multi-purpose iSeries to compete with a dedicated
> dual-CPU app server?

You wouldn't in most cases. The point was really around why porting an
intensive J2EE app to AS400 app server architectures (WebSphere for one),
that'll cost a fortune and still potentially have issues, compared to
running the identical app on Linux, Solaris or even Windows app servers at
a fraction of the cost and full performance and reliability.

> What were the processor speeds on the two boxes?
> How much RAM?

7495 x 8 / 48G
7495 x 4 / 48G

> Was the iSeries dedicated to web serving, or was it doing
> other things?

Tried in both scenarios, it came down to the IBM implementation of java on
the AS400 that caused issues, WebSphere app server's performance under load
of running a J2EE compliant WAR basically fell to bits. No success either
with the IBM chaps.

>
> >  Eventual recommendation was we stay
> > with Xeon for app server level software because IBM couldn't fully fix
> an
> > AS400 / Java specific implementation issue.
>
> What "AS400 / Java implementation issue" was this?

Because of issues we saw, I can only advise on making sure it's what you
need and works, we've had a 1 year long priority 1 call that still couldn't
be fixed with the recommendation to stay on alternative platforms. Details
of which IBM are aware of but you'll only find out if you come across it
yourself - I can't advise on any specifics, Sorry.

Pete.



>
> Joe
>
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