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Status Delivered
Workspace AIX
Created by Guest
Created on Oct 9, 2019

Make 15 second IO-Freeze time configurable

When a FC port on a storage controller goes offline, the switch sends a RSCN event to AIX, which then freezes all IO on all disks that were logged in through that port for 15 seconds. This is part of the fast_fail and dyntrk options on the fscsi device.

This IO freeze should be configurable as a parameter to the fscsi device, so we can set it to a lower value.

Idea priority High
  • Guest
    Oct 12, 2023

    Is there any link to an APAR or article explaining the new feature/attribute ?

  • Guest
    Oct 12, 2023
    Included in AIX 7.3 TL1
  • Guest
    Oct 28, 2019

    The AIX FC driver holds on to the one I/O it is working on for 15 seconds, but the SCSI/MPIO code will continue to use other paths for other I/Os during that 15 second window, particularly if shortest_queue algorithm is used.