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Status Delivered
Workspace IBM Z and LinuxONE Systems Hardware
Categories General/Miscellaneous
Created by Guest
Created on Jul 1, 2019

RELATED IDEAS

Increase the max engine limit from 256 to higher number

System: z/OS
Actor: Please increase the max engine limit from 256 to higher number on HMC for a lpar
Description:
Currently the max engine limit is set to 256 which includes sum of initial and reserved cp and ziip which is again multiplied by 2. We need this limit to be increased to a higher number so that we are able to allocate more initial and reserved for our lpars which are designed to run more workload. We have bigger cecs on which we run bigger system where we have a need to have bigger config and the limit 256 is causing issues and stopping us to load the llpar if we have bigger numbers and then availability of the logicals if we have not mentioned during the initial load is posing serious threats to our systems

Idea priority High
  • Guest
    Reply
    |     Feb 26, 2021

    Customer just ask: Is there any limitation on #of CPs on z15s that CEC can have crossing which LPARs won't come up during IPLs? We had an issue on z14s with #initial CPs + reserves + Initial zIIPs + Reserve zIIps crossing 255 limit and LPARs did not come up. Sandeep opened a RFE and requested to change it. IBM said they increased these limits on z15s and closed RFE. However, we did not know what the limits are on z15s now. Could you please let us know tomorrow as we need to know for our Hub failure test on 02/26 (this Friday).
    This is the RFE - 134275
    Customer want to know if this was implemented. I've talked to SE and LPAR Dev and this seems to have not been implemented. Wondering if this should be a line item to get a sizing of the code impact?

  • Guest
    Reply
    |     Aug 27, 2020

    .Thank you for your feedback. These recommendations were considered during development of z15.

  • Guest
    Reply
    |     Aug 20, 2020

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Hardware
    Product - z Systems Hardware
    Component - General/Miscellaneous

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - z Systems Hardware
    Product - z Systems Hardware
    Component - LPAR

  • Guest
    Reply
    |     Aug 14, 2019

    I do not quite understand the request. The HMC allows you to create a logical partition with up to 170 combined initial plus reserved logical cores defined (for the largest z14 models). This matches the maximum number of physical processor cores that can be purchased/configured/activated on these models. In turn these logical cores can be single or multi-threaded thus the configuration can support up to 340 logical CPUs in a single partition. Having more logical cores than physical cores for a single logical partition is inefficient so I don't think this is what you are going after here.

    Are you asking to raise some limit of a specific operating system and what they support (I suspect z/OS)?

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