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Status Future consideration
Workspace IBM i
Categories Storage
Created by Guest
Created on Sep 3, 2019

RELATED IDEAS

Automatically disable disk paths that experience repeated timeouts

IBM i is not able to intelligently avoid repeatedly using non-functioning disk paths that identify themselves as functional. Repeated I/O timeouts cause long periods of disruption and very poor performance often resulting in abnormal termination of interactive user and batch jobs.


Use Case:

Paths can and do fail, which is why it is a best practice to configure hardware redundancy in the host, SAN, and storage subsystem levels. This redundancy comes at a prices, but IBM i is not taking advantage of it on certain path failures. Currently, when a path fails, IBM i will repeatedly attempt to use a nonfunctional path, and this can cause long periods (hours) of very poor system performance if no outside action is taken. It also makes sense to include robust error handling in the software (IBM i). IBM i should be changed so that the device driver automatically disables paths that experience 2-3 timeouts in rapid succession. Ideally, the driver would send a message to QSYSOPR pending retry. After SAN maintenance has been completed, the message would be retried and paths would go active again. In this method, users can control the retries, similar to a communication line failure, and not have the system continually attempt to use a non-usable path.


Idea priority High
  • Guest
    Reply
    |     Feb 21, 2020

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - Power Systems
    Product - IBM i
    Component - Storage
    Operating system - IBM i
    Source - None

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - Power Systems
    Product - IBM i
    Component - Availability, Recovery
    Operating system - IBM i
    Source - None

  • Guest
    Reply
    |     Feb 17, 2020

    The COMMON Europe Advisory Council (CEAC) has reviewed this requirement and recommends that IBM view this as a MEDIUM priority requirement that should be addressed.

    Background: The CEAC members have a broad range of experience in working with small and medium-sized IBM i customers. CEAC has a crucial role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community and has therefore reviewed your RFE.

    To find out how CEAC help to shape the future of IBM i, see CEAC @ ibm.biz/BdYSYj and the article "The Five Hottest IBM i RFEs Of The Quarter" at ibm.biz/BdYSZT

    Therese Eaton – CEAC Program Manager, IBM

  • Guest
    Reply
    |     Sep 5, 2019

    I've never seen this happen. IBM should contact this submitter and get a better understanding of what the issue really is.

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