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Status Delivered
Workspace AIX
Created by Guest
Created on Oct 10, 2018

RELATED IDEAS

AIX rw_timeout =40 didn't work over 491 seconds becaus of current AIX FC behavior

System: IBM AIX
Actor: Customer needs rw_timeout hit as defined in ODM.

Description: There are many redundancy solutions for robust disk I/O availability - redundant HBAs, redundant SAN switches and even redundant servers. But rw_timeout=40 didn't work because of current FC behavior. And actually it resulted 491 seconds disk I/O blocking.
My customer Woori Bank is strongly asking to have smarter rw_timeout working as defined in ODM.

Idea priority High
  • Guest
    Reply
    |     Dec 16, 2019

    AIX 7.2 TL 4 contains enhancements establishing configurable values which will create boundaries around the amount of time an I/O request can be outstanding. This will, in some cases, limit the amount of retries and SAN related error recovery delays associated with a given I/O request when those retries result in I/O delays exceeding the established, configurable limit set for a device. Also in this release are mprovements in the command I/O flow during error recovery to ensure commands are not held at the device driver level any longer than is absolutely necessary.

  • Guest
    Reply
    |     Mar 28, 2019

    AIX is pursuing updates in future releases intended to improve I/O response time in the case of certain SAN related error conditions. In future releases of AIX 7.2 we are establishing configurable values which will create boundaries around the amount of time an I/O request can be outstanding. This will, in some cases, limit the amount of retries and SAN related error recovery delays associated with a given I/O request when those retries result in I/O delays exceeding the established, configurable limit set for a device. Also we are making improvements in the command I/O flow during error recovery to ensure commands are not held at the device driver level any longer than is absolutely necessary.

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