?
Solved

IBM LPM performance issue

Posted on 2014-02-13
4
Medium Priority
?
461 Views
Last Modified: 2014-02-13
I recently had performance issues when I was LPM'ing a DB server from one frame to another, The server had 56GB and took almost an hour, But I have a similar machine with the same metrics and had 10% more load than the previous one which took only 40 min.

Also on the first one which I was LPM'd had application slowness and queries hanging, So does LPM have performance issues because IBM says its not the case...
0
Comment
Question by:aanya247
  • 2
  • 2
4 Comments
 
LVL 68

Accepted Solution

by:
woolmilkporc earned 2000 total points
ID: 39857119
If the whole system (not just the LPAR) in question runs near 100% (all CPUs) I can imagine that the small LPM overhead could have an effect on LPAR peformance, but if there's a bit CPU left no one should even notice that LPM is running (but see below).

If you don't have a dedicated connection LPM slowness could be due to network congestion, but from my experience the greatest impact on LPM speed is always by memory activity.

It's not the consumed amount of main memory which counts, it's the change rate.

A big amount of static memory can be transferred just easily, but continuously changing memory content is a challenge for LPM.

The more "dynamic" the memory is the longer LPM will have to try to transfer as much memory as possible, and the longer the whole process will take.

There is a short moment where LPAR processing has to be suspended in order to transfer the remaining memory content (which is too dynamic to be transferred on the fly) and to pass control to the target system.
The higher this amount of memory the longer the suspend time - this can potentially lead to application outages.

wmp
0
 

Author Comment

by:aanya247
ID: 39857437
thank you so much for the explanation, So u know how long is the theoretical suspend time according to IBM , Or Is this not published....
0
 
LVL 68

Expert Comment

by:woolmilkporc
ID: 39857470
This is not published, as far as I know.
 
Certainly because it depends on too many things, but certainly also because IBM don't want to upset the apple cart (or want to let sleeping dogs lie, if you prefer).
0
 

Author Comment

by:aanya247
ID: 39857516
Thank you...
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Let's say you need to move the data of a file system from one partition to another. This generally involves dismounting the file system, backing it up to tapes, and restoring it to a new partition. You may also copy the file system from one place to…
Introduction Regular patching is part of a system administrator's tasks. However, many patches require that the system be in single-user mode before they can be installed. A cluster patch in particular can take quite a while to apply if the machine…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
In a previous video, we went over how to export a DynamoDB table into Amazon S3.  In this video, we show how to load the export from S3 into a DynamoDB table.
Suggested Courses

621 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question