HP StorageWorks 8/80 HP StorageWorks Fabric OS 6.2 administrator guide (5697-0 - Page 291
Forcing out-of-order frame delivery across topology changes, Restoring in-order frame delivery
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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 example, if a link goes down), traffic is rerouted around the failure, and some frames could be delivered out of order. Most destination devices tolerate out-of-order delivery, but some do not. Use of out-of-order frame-based delivery can minimize the number of frames dropped, while enabling in-order delivery (IOD) guarantees that frames are either delivered in order or dropped. All HP B-series switches enable IOD by default to ensure frames are delivered in order, as not all HP destination devices can tolerate out-of-order frames. Forcing out-of-order frame delivery across topology changes 1. Connect to the switch and log in as admin. 2. Enter the iodReset command. IMPORTANT: This command can cause a delay in the establishment of a new path when a topology change occurs; use it with care. 3. Confirm the in-order delivery has been disabled by entering the iodShow command. Restoring in-order frame delivery across topology changes 1. Connect to the switch and log in as admin. 2. Enter the iodSet command. Fabric OS 6.2 administrator guide 289