Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

iSeries Memory Utilization

Posted on 2016-07-18
2
Medium Priority
?
166 Views
Last Modified: 2016-07-18
I am wondering what the best way is to see how much memory is currently being utilized on an iSeries server.

I have 24 GB of RAM on the server. I am wondering if there is a way to see how much of this is actually being used? Can I see if the system is "RAM-starved"?
0
Comment
Question by:Matthew Roessner
2 Comments
 
LVL 18

Expert Comment

by:Dave Ford
ID: 41717629
Start with the WrkSysSts command to show memory-pool sizes and utilization ... as well as disk-space and it's utilization.

HTH,
DaveSlash
0
 
LVL 36

Accepted Solution

by:
Gary Patterson earned 2000 total points
ID: 41717636
Generally the answer is "all of it", except possibly on some very lightly used systems.  IBM i loads  programs and data into memory as it is called for, and pages out "least recently used" memory pages only when needed to make room for something that an active job is calling for.  The system will generally make use of as much physical memory as you care to install - so if you were to track memory utilization on most non-idle systems, it would go up to 100% pretty quickly after the system is started, and stay there forever.  

As a result, we generally don't use memory % utilization as a meaningful metric on IBM i.

Generally, "RAM starved" systems will show high faulting rates in DSPSYSSTS during peak system utilization periods and will generally exhibit high disk I/O waits if you use a tool like IBM iDoctor Job Watcher.

RAM starved systems usually also tend to have high disk utilization (DSPDSKSTS over 40% busy), and often have lower-than expected CPU utilization peaks, as the system is waiting on date to get paged in off of disk rather than doing useful work.
2

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

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

This applies to Dell but may also apply to other manufacturers as well. We ran across a few machines that just dropped recently it trust relationship with the server. After doing the basic removing and joining the domain again, it changed to No logo…
Are you a startup company? Being a startup, you may be using shared hosting, or maybe even dedicated hosting. But have you ever given a thought to using cloud computing now? Yes, don’t be surprised, it is possible for startups to opt for cloud compu…
Loops Section Overview
As many of you are aware about Scanpst.exe utility which is owned by Microsoft itself to repair inaccessible or damaged PST files, but the question is do you really think Scanpst.exe is capable to repair all sorts of PST related corruption issues?
Suggested Courses

581 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