Cisco MDS 9000 series Configuration Manual page 20

Terminology
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
sites. Acceleration is provided for flows traversing the MAN or WAN across sites. The main reason
to classify the sites is to select the intersite flows for acceleration. No intrasite flows will be allowed
to participate in acceleration.
Note
IOA Interface—Represents a single service engine in the MSM-18/4 Module or the SSN-16
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Module. An IOA interface must be provisioined to enable IOA service on the service engine. The
MSM-18/4 Module has one service engine and the SSN-16 Module has four service engines, which
directly represents the number of IOA interfaces that can be created on these modules. In the CLI,
an IOA interface is represented as interface ioa x/y where x represents the slot and y represents the
service engine ID. With the SSN-16, the service engine ID can be 1 to 4. Each IOA interface requires
a IOA license to be checked out.
An IOA interface must be brought up administratively to enable the IOA service on the service
engine.
IOA Switch—Represents a switch that has one or more IOA Interfaces configured for the IOA
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service. The terms IOA switch and IOA node are used interchangeably in this configuration guide.
IOA Cluster—A set of IOA switches that can operate in a coordinated manner to provide the IOA
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service. An IOA cluster can only span two IOA sites. If there is a consolidation site that has
connectivity to various other sites, each site pair must be represented by a unique IOA cluster. A
switch may participate in multiple IOA clusters due to this reason, but each IOA interface is bound
only to one IOA cluster. This architecture allows for cluster scalability and limiting the scope of
configuration distribution as appropriate.
IOA N Port—Represents a Fibre Channel N port represented by a port world-wide name. IOA
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requires that the site to which the N port belongs and the VSAN ID be configured. The site
classification is required to identify how to redirect the traffic flow for acceleration.
• FC-Redirect —Fibre Channel Redirect (FC-Redirect) infrastructure provides the ability to redirect
a flow to a specific service engine in the fabric to provide certain intelligent services such as Storage
Media Encryption and Data Mobility Manager. This infrastructure has been extended for IOA to
redirect the flow to two service engines in the fabric that can then work together to provide the
acceleration intelligence.
Both the host and the target or tape must be directly attached to a FC-Redirect-capable switch.
IOA Flow—A flow that is accelerated across the MAN or WAN by the IOA cluster. Each IOA flow
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is identified by initiator PWWN and target PWWN.
IOA provide bidirectional acceleration for each configured flow. A separate reverse flow
configuration is not required.
IOA Flow Group—A set of IOA flows classified for a specific purpose. For example, if the same
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IOA cluster is being used for remote replication and backup, you can have all the replication flows
classified into the replication flow group and all the backup flows classified into the backup flow
group.
Cisco MDS 9000 Family I/O Accelerator Configuration Guide
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When using the CLI, only the switches where IOA is deployed need to be classified into a
site. When using the Fabric Manager, all the switches in a physical location need to be
classified into a site. The site classification is used internally by the Fabric Manager to
automate the classification of the flows that traverse across sites.
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OL-20708-01, Cisco MDS NX-OS Release 5.0(1a)
Overview