Re: V5R3M0 upgrade issues (PERFORMANCE Issues)

[Scott Klement <midrange-l@xxxxxxxxxxxxxxxx>]

This isn't an RPG issue, so I'm replying to MIDRANGE-L.

I've had HORRIBLE performance since upgrading to V5R3. It's not one thing 
being slower, it's everything.  V5R3 is a terrible performer, there's no 
question about it.

Talking to various people, they told me:

suggestion: The cache battery on your disks may be dead.
reply: It's not.


suggestion: You need more memory, the upgrade to V5R3 was the straw that 
broke the camels back.

reply: I doubled the memory, and although it's faster than it was before, 
it's still much slower than V5R2


suggestion: You could X and Y and that'd make your applications more 
efficient.

reply: True, but this didn't change when I upgraded to V5R3. They were 
like this on V5R2, and writing new, more optimized, code for every program 
on my system just so that the operating system doesn't seem so slow seems 
like a workaround rather than a solution.


All of the "experts" I've talked to have told me that V5R3 performs just 
as well as V5R2.  I checked into this before I upgraded.  However, there's 
absolutely no question that this isn't true.  I suspect that somewhere in 
all the changes of the virtualization engine, they did something that 
slows it all down.

At this point, though, i'm stuck with it until we're able to budget for a 
faster computer.  (We're running a 270)

---
Scott Klement  http://www.scottklement.com

On Thu, 6 Apr 2006, Jon Allen wrote:

> Non-RPG issue, sorry about this, but...
>
> I wonder if anyone has had performance problems after upgrading to
> V5R3M0.  We upgraded last Friday and have been experiencing the
> following problems.  We are wondering if anyone can help us out.  We
> have an 810 by the way.
>
> Since the upgrade our CPU% has not gone above 50%, we usually average
> around 90%
>
> We also run applications out of the PASE environment and they are
> running miserably slow.  This is killing our day to day processing. 30
> minute jobs taking 8 hours to complete.
>
> We are at a loss as to what happened and IBM is still as confused as we
> are.
>
> Please advise if you know of anything we can try.
>
> Thanks!