Blog
i can

Dawn May

Dawn May




Bookmark and Share

October 2014

Sun Mon Tue Wed Thu Fri Sat
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31  

« i Can … Benefit from IBM Systems Lab Services and Training | Main | How to Use the Integrated Web Application Server »

September 08, 2010

TrackBack

TrackBack URL for this entry:
http://www.typepad.com/services/trackback/6a00d83545a5d153ef0133f3fb50ba970b

Listed below are links to weblogs that reference i Can … Use Subsystems With Many Devices:

Comments

Good information, thanks for sharing. What was the last release that the work management manuals where updated for page fault ranges and recommended memory settings?

Hi Travis,
We tend to not document specific performance recommendations any more because there is such a wide variety of applications and workloads that the answer is always "it depends".

General performance tuning information is now in the Information Center under the Performance section (Systems Management -> Performance -> Managing System Performance -> Tuning Performance).

We published a Redbook in November of 2009 that included information on tuning as well as some basic guidelines. The name of this Redbook is "End to End Performance Management on IBM i" and can be found here:
http://www.redbooks.ibm.com/Redbooks.nsf/RedbookAbstracts/sg247808.html?Open

Hi May, interesting the large number of devices in a single sbs, what about the opposite? for example to have 300 active sbs. I have an ISV application that uses a SBSD for a "logical" group of users and now, in a process of consolidation, these groups can be 300. Do you know situations where hundreds of sbs are used succesfully?

Hi Stefano,
As documented by the Maximum capacities section in the Information Center under the work management limits, http://publib.boulder.ibm.com/infocenter/iseries/v7r1m0/topic/rzamp/rzampwrkmgmt.htm, the maximum number of active subsystems the system supports is 32,767. Since a subsystem job is just another job, it counts toward the total maximum number of jobs in the system as well. Using subsystems as a way to consolidate workloads on to a single partition is common.

However, as the number of active subsystems increases, there are some operations that may take longer to run as the system has to inspect information about every subsystem. For example, starting and ending subsystems.

Of course, if you start or end a lot of subsystems all at the same time, you can consume a lot of system resources.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been saved. Comments are moderated and will not appear until approved by the author. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Comments are moderated, and will not appear until the author has approved them.