Iodset – Dell POWEREDGE M1000E User Manual

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Fabric OS Command Reference

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iodSet

Enables in-order delivery (IOD).

SYNOPSIS

iodset

iodset --help

DESCRIPTION

Use this command to enforce in-order delivery of frames during a fabric topology change.

In a stable fabric, frames are always delivered in order, even when the traffic between switches is shared
among multiple paths. However, when topology changes occur in the fabric (for instance, a link goes
down), traffic is rerouted around the failure and some frames might be delivered out of order. This
command ensures that frames are not delivered out-of-order, even during fabric topology changes. It
enforces a sufficient delay between the event that causes an existing path to be removed and the
establishment of a new path, so that frames are delivered in order. However, this also means that frames
are dropped during the delay, causing I/O failures.

When used without operands, iodSet enables in-order-delivery of frames on a switch (legacy IOD
behavior). Frame loss is unavoidable when a port goes down.

IOD is disabled by default. Use iodShow to display current settings. Use iodReSet to restore the default
setting.

NOTES

You can no longer use this command to manage Lossless DLS. Use dlsSet instead. The following
command options are deprecated in Fabric OS v6.4.0 and later:

•

iodset --enable -lossLessDls

•

iodset --disable -lossLessDls

•

iodset --show

The execution of this command is subject to Virtual Fabric or Admin Domain restrictions that may be in
place. Refer to Chapter 1, "Using Fabric OS Commands" and Appendix A, "Command Availability" for
details.

OPERANDS

This command has the following operands:

--help

Displays the command usage.

EXAMPLES

To display the default legacy IOD setting:

switch:admin> iodshow

IOD is not set

To enable IOD:

switch:admin> iodset

IOD is set