starting with wlm

[Shelley_4]

Hi,

I want to start implementing WLM.
How do I start? What config can I define that won't disturb the users or applications in the beginning, until I can monitor them properly and understand their needs?

If I give a wide range of CPU (say min=10 and max=90), then WLM takes me down to minimum. If I give too much (min=85, max=90) then a process gets more CPU than it needs most of the time.

Can anybody give me examples of hoe they've started?

Thanks, Shelley.

[Steve Steel]

Hi

Use

http://www.techtarget.com/

Select hp.com

Select searchhp

Use WLM

Gives great info but you need to register


steve Steel

[Jonathan Fears]

Hello Shelley,

The first thing I would suggest you do before implementing WLM is read all the documentation you can. A great source is WLM's web page at http://www.hp.com/go/wlm. It is loaded with white papers and example configurations.

To explain your situation above, from the information you gave I assume you are using the min and max keywords in an SLO structure with no goal statement. There are two types of SLOs: goal-based and entitlement-based. This is one example of an entitlement-based SLO. WLM simply grants the workload a specified amount of CPU; in this case it always gives the min. Min and max specify the range of CPU the SLO can request. However, an SLO only requests CPU when a goal (either metric or usage) is not being met. As a result, entitlement-based SLOs (which have no goal statement) do not request additional CPU for the workload.

One way to start (since I assume you have no data collectors yet to provide metrics to the SLO) is to use usage goals. Usage goal-based SLOs indicate how efficiently, within a certain range, a workload should use its CPU entitlement. The default range is 50 to 75 percent. A workload's efficiency is the amount of CPU it is using divided by its current CPU entitlement. If a workload is not consuming enough of its entitlement (or has a low efficiency), it reduces its entitlement. The opposite happens if it has a high efficiency. The entitlement is bounded by the min and max values specified in the SLO.

This and many other topics are covered in the WLM user's guide and white paper. The white paper not only gives a great overview of WLM and its concepts, but also has a section entitled "Managing application performance: quick start" which should help you get started.

[Shelley_4]

Thank you for the answer, Jonathan.
I have read all kinds of documents, but am still afraid to start, so that I don't mess up the whole computer. Your idea with using the efficiency goals is a good way to start, probably, and then tune the SLOs later.

I would like to hear from anybody thtat can tell me how they've started and share some of the mistakes they've done.

Thanks, Shelley.