Hi Al, Back from holidays, I was reading the requests about IRD and DC/GCL and saw you answered them.
My understanding is however, that IRD Weight management stops, "when an LPAR is softcapped", both by the Defined Capacity and by the Group Capacity Limit. This is probably explainable, because GCL takes the current Weights into consideration when distributing the GC MSUs over the LPARs and cannot handle weights being manipulated behind its back by IRD. However IRD in fact is also WLM, so these components could have coordinated their actions, but don't. As you describe, this is very undesirable and can cause problems. I opened an PRM at IBM to check this behavior and they confirmed this. I also asked what happens when I stop IRD. Then the weights are kept at their current, probably unusable values. Also IBM answered that they had no intention to change this, so this makes me conclude that IRD and DC/GCL do not cooperate, in fact they do the opposite, resulting in undesired LPAR settings. Kees. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Al Sherkow Sent: Friday, February 15, 2013 17:03 To: [email protected] Subject: Re: Defined capacity IRD weight management and Defined Capacity work fine. The problem comes with IRD and LPAR Group Capacity Limits (introduced in z/OS 1.8). The problem is when an LPAR Group is capped IRD stops adjusting weights. This is rather unfortunate as this is the time when a customer would most want IRD to adjust the weights within the limits of the LPAR Group Limit. When a group of LPARs is capped the effect is the same as that group being out of capacity. That is there is more workload trying to run than the amount of capacity available. When this group cap is set some LPARs may be running low importance work consuming CPU time in the group. Simultaneously other LPARs may really be feeling the capacity stress and these may stop running importance 4, 5 and discretionary work. At this point is would be great if IRD would move capacity away from the low importance work in the group, to the LPARs that are impacting more important work. This is what IRD weight management would do. You can use both of these capabilities together, but you must understand that weight management stops, as it is at the time the group cap "turns on". Al Sherkow, I/S Management Strategies, Ltd. Consulting Expertise on IBM Workload License Charges (WLC), LPARs and LCS Software Seminars on IBM Mainframe Software Pricing +1 414 332-3062 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ******************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ******************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
