Skip to Main Content
IBM Power Ideas Portal

This portal is to open public enhancement requests against IBM Power Systems products, including IBM i. 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 (

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 ( - Use this site to find out additional information and details about the IBM Ideas process and statuses.

IBM Unified Ideas Portal ( - Use this site to view all of your ideas, create new ideas for any IBM product, or search for ideas across all of IBM. - Use this email to suggest enhancements to the Ideas process or request help from IBM for submitting your Ideas.

Status Not under consideration
Workspace AIX
Created by Guest
Created on Jan 21, 2020

rw_max_time change to 30

I want to be able to set the minimum value of "rw_max_time" which is the attribute value of hdisk to 30.

Idea priority High
  • Guest
    Mar 26, 2020

    There is no consideration at this time to lower the current minimum allowed value of the rw_max_time of 60 seconds

  • Guest
    Mar 26, 2020

    rw_max_time is a new attribute released in AIX 7.2 Technology level 4. It is important to understand that rw_max_time is separate from the rw_timeout attribute:

    The rw_timeout attribute specifies the time, in seconds, that a SCSI command is allowed for completion each time it is issued to a storage device. In an MPIO environment, a command can experience more than one timeout as it is retried on different paths.

    The disk ODM, contained in AIX for Fibre Channel attached disks, uses a default value of 30 seconds for rw_timeout. For some devices, AIX allows setting the rw_timeout attribute to values as low as 10 seconds.

    rw_max_time specifies an approximate maximum time taken by an MPIO device, in seconds, to complete each I/O operation. The time is measured from when the I/O request is issued to the disk driver to when the disk driver returns the I/O request to the calling process.

    rw_timeout is the maximum time an I/O should be allowed to be outstanding when issued down a given path. rw_max_time specifies the limit of the cumulative time the AIX disk driver should allow for an I/O to be outstanding regardless of the number of paths available to the device.