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Status Delivered
Workspace AIX
Created by Guest
Created on Mar 21, 2018

RELATED IDEAS

The current AIX rw_timeout minium limit 30 seconds is to high/long for modern IT environment.

System: IBM AIX
Actor: Customer needs rw_timeout minium limit less then 30 seconds. And needs to know hit time along with the rw_timeout.

Description: There are many redundancy solutions for robust disk I/O availability - redundant HBAs, redundant SAN switches, etc. So 30 seconds of rw_timeout is too long for modern IT environment.
My customer KEB Hana Bank is strongly asking to have less then 30 seconds of rw_timeout. And need to know exact time when the timeout occurs along with rw_timeout.

Idea priority High
  • Guest
    Reply
    |     Dec 17, 2019

    AIX 7.2 TL 4 permits SAN attached storage to indicate read / write timeout values as low as 15 seconds. The actual timeout value used is dependent upon the particular model of SAN storage being attached and the read/write timeout values the vendor for that storage believes can be supported.

  • Guest
    Reply
    |     Jun 22, 2018

    AIX is evaluating updates in the 2019 release of AIX 7.2 to permit SAN storage devices to use read / write timeout values as low as 15 seconds. Third party storage devices used with AIX would be required to update their ODM to allow lower timeout values and perform a qualification test to ensure the lower timeout values are fully compatible with the device through the range of conditions under which the device is expected to operate.

  • Guest
    Reply
    |     May 9, 2018

    The PMR indicates the customer is using Hitachi SAN attached storage with HDLM PCM for AIX MPIO. AIX depends upon the storage vendor to provide the read / write time out values to be used by AIX for that subsystem. In the case of Hitachi storage, Hitachi is indicating a read / write timeout value of 60 seconds should be used. A change in the read / write timeout value for this subsystem must occur with the consent of Hitachi.

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