RE: Java on 7.1 one system fast other system very slow

They are both Model 41A and both have processor EPXK

I did have it pointed out that the slow machine has 2 disk drives (
and the fast one has 6 drives)
And that may be an issue.
Size % I/O Request Read Write
Read Write %
Unit Type (M) Used Rqs Size (K) Rqs Rqs (K)
(K) Busy
1 59FD 139594 23.9 11.0 5.2 .6 10.4
5.1 5.2 0
1 59FD 139594 23.9 12.3 5.2 3.2 9.1
4.7 5.4 0

As a last resort I could try reloading 5770SS1 option 3
(I will keep that one in my back pocket until IBM takes a look)

John


-----Original Message-----
From: DrFranken [mailto:midrange@xxxxxxxxxxxx]
Sent: Tuesday, August 18, 2015 10:45 AM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: Re: Java on 7.1 one system fast other system very slow

Agreed the question seems silly. However I recently on two identical
brand new POWER8 servers running i 7.1 had a task that was VERY
heavily I/O bound on all IFS work. On the one server the task took 78
seconds.
On the other it took over 90. MINUTES.

IBM was not so friendly in helping. Performance data said that 100% of
cache writes were failing (cache full). Despite the disk units being
only about 5% busy, they sent the problem to hardware because 'it must
be a bad cache battery'. (Not only was it not, there are none in the
servers!) In the end the problem was not actually ever figured out
BUT re-installing 5770SS1 option 3 suddenly solved the problem. Option
3 was flagged in error when we ran the network verify component of
ARE. Oddly CHKPRDOP *OPSYS had NOT flagged this.

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 8/17/2015 6:39 PM, Nathan Andelin wrote:

What could cause a variance of the simple execution of "JAVA

*VERSION"

Different machine models? Wide difference in CPW ratings? Model 720

vs.

model 520?

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