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Status Future consideration
Workspace AIX
Created by Guest
Created on Jun 23, 2020

RELATED IDEAS

FOM Design Change Request

In the event of FOM related failures, current standard recovery procedures are causing longer service outages, which have a greater impact on business. For banking customers, all FC adapters are redundant by FOM, so in case of failure immediate take over is required.

EMXO and PCIe is a hardware subsystem and hypervisor firmware can only initiate link training. If link goes down, hypervisor is notified to log and start HW recovery.

Regarding EEH handling, when PCIe link is down, PCIe bus is frozen. AIX starts EEH timer when the driver learns bus is frozen on card by card basis.

“pcibus_eeh_perm_timeout” is a parameter for base set point. Default is 300s and current setting for KEB Hana Bank is 30s.

This value, 30s is too long for KEB Hana Bank

Idea priority Urgent
  • Guest
    Reply
    |     Jul 20, 2020

    AIX is not considering support of pcibus_eeh_perm_timeout values of less than 30 seconds. 30 seconds is a common timeout value for read/write operations to storage. read/write timeouts are far more common events than EEH. AIX development does not see an overall value of allowing lower pcibus_eeh_perm_timeout value than 30 seconds.

    AIX is considering updates to future releases that would improve MPIO error detection and failover times caused by EEH events. However, nothing is committed to plan at this point.

  • Guest
    Reply
    |     Jul 20, 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 AIX
    Component - Product functionality
    Operating system - IBM AIX
    Source - Client

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

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