IBM Z Hardware and Operating Systems Ideas Portal


This is the public portal for all IBM Z Hardware and Operating System related offerings. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).


Shape the future of IBM!

We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:

Search existing ideas

Start by searching and reviewing ideas and requests to enhance a product or service. Take a look at ideas others have posted, and add a comment, vote, or subscribe to updates on them if they matter to you. If you can't find what you are looking for,

Post your ideas

  1. Post an idea.

  2. Get feedback from the IBM team and other customers to refine your idea.

  3. Follow the idea through the IBM Ideas process.


Specific links you will want to bookmark for future use

Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.

IBM Unified Ideas Portal (https://ideas.ibm.com) - Use this site to view all of your ideas, create new ideas for any IBM product, or search for ideas across all of IBM.

ideasibm@us.ibm.com - Use this email to suggest enhancements to the Ideas process or request help from IBM for submitting your Ideas.

Add a new idea Subscribe
Status Future consideration
Workspace z/OS
Categories BCP_IOS
Created by Guest
Created on Oct 23, 2015

RELATED IDEAS

Long IOS recovery time in HyperPAV environment

Customer has concern about the IOS recovery time when the dasd devices are unresponsive.
When IFCC or MIH type error occurs, IOS performs the DPS validation. During this DPSVAL, if the SNID (Sense Path Group ID) command fails, the defective path is taken offline with message IOS450E PERMANENT I/O, PATH TAKEN OFFLINE. If the device is completely unresponsive, the SNID command would fail as MIH. DPSVAL processing sets the special timeout value, 15 seconds once and 5 seconds twice. So, the path should be taken offline after about 25 seconds and the application I/O should resume after that.
The problem here is that in HyperPAV environment, the time for the IOS recovery (the time between the triggering H/W error and the application I/O resume) seems to be much longer because the application I/O resumes after DPSVAL against both PAV base and alias devices. For example, if the PAV base device is bounded to 3 aliases, DPSVAL processing is done serially for the base and each alias devices. So, it would take 25 * 4 = 100 seconds for these DPSVAL and the application I/O resumes after that.
APAR OA45514 would change the SNID command timeout value to the small one, but so long as this serial DPSVAL execution for all PAV base/alias occurs, this APAR is not so effective.

Idea priority Medium
  • Guest
    Reply
    |     Dec 19, 2019

    Path thresholding is not very useful to us if the path doesn't come off quickly enough to save XRC.

    The case that brought us here is TS003115451

  • Guest
    Reply
    |     Oct 24, 2015

    Creating a new RFE based on Community RFE #78757 in product z/OS.

  • Guest
    Reply
    |     Oct 23, 2015

    Attachment (Description): related PMR

    PMR63359_693_76...
    PMR63359_693_760.txt
    Open full size
    PMR63359_693_760.txt

By clicking the "Post Comment" or "Submit Idea" button, you are agreeing to the IBM Ideas Portal Terms of Use.
Do not place IBM confidential, company confidential, or personal information into any field.