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